It's been a tumultuous few days for British tennis, with the high of an historic Davis Cup triumph giving way to debate raging over the future of the game on these shores.

Here, Sportsmail's Graham Swann quizzes Tennis Scotland chief executive David Marshall about the burning issues and whether or not it is too much to expect another 'Andy Murray' to emerge...

Tennis Scotland chief executive David Marshall (second from right) says securing funding is difficult

(From left to right): Great Britain's James Ward, Kyle Edmund, Andy Murray, Jamie Murray, Dom Inglot and captain Leon Smith pose with the Davis Cup trophy during a photocall at Lee Valley Tennis Centre

Given your role at Tennis Scotland, what is your response to Andy Murray's criticism of the Lawn Tennis Association and the way the game is being run in Britain?

I think there are certain things being highlighted that are well known and some of the performance discussions have been going on for a couple of years in terms of: where is the next Andy Murray coming from?

The performance discussion is ongoing because there is not another Murray there. Although I thought Kyle Edmund played fantastically well in that first match for two sets (in the Davis Cup final against Belgium). In some ways, you think could Kyle be the new Andy in two, three, four years? That's maybe as good as it gets.

Some of Andy's comments are to do with the National Tennis Centre (NTC) itself. I think its use has been planned to be changed and I guess it does get used. But, like with any tennis centre, you can walk in at certain times and the courts are not being used. It doesn't mean to say they are always empty.

Great Britain's Davis Cup team meet Prime Minister David Cameron (centre) in at 10 Downing Street

Murray is mobbed by his Great Britain team-mates after defeating David Goffin in the Davis Cup final

I think Michael Downey (the chief executive of the LTA) was quite clear that the performance set up wasn't working, which is why he has made the changes he has instigated now. In some ways, the LTA will agree that a lot of things need to change. We're in the process of really looking at how we manage younger kids and adults who are on the pathway. The journey from being a good junior to a good senior, like Andy – there are not many players in the world doing that.

The transition from juniors to senior is taking a lot longer and I think the average age in the top 100 is going up. You're more likely to be there when you' re 24 rather than like Andy when he was there at 17, 18, 19.

But the players now are finding it a lot more difficult because the top four in the world have moved the game on. Being able to play a good couple of rounds isn't enough – if you want to be world class you have to have a lot more in your game.

In terms of legacy from Andy, we've been very aware we have waited a long time for an 'Andy' to come along in the British infrastructure. He is just an incredible athlete and player. We have a good profile of what it takes to be an 'Andy' and it's very difficult to suggest what you would do to produce a world-class talent.

But, if you've got more people playing you have a better chance. We've always been punching above our weight in Scotland. We've had a lot of good juniors coming through but the transition to senior is very tricky.

Edmund hits a return shot during a practice session ahead of the Davis Cup final against Belgium

Andy said it was a 'waste of time' talking to the LTA, while his brother Jamie insisted 'not enough is being done' in Scotland. Do they have a point?

We have to put in the context – Tennis Scotland's turnover this year is £1.6million. We don't build tennis courts. We enable people to play tennis. If we tried to do it ourselves we'd be unsuccessful because we don't have a big team. We get money from sportscotland and the LTA and work with partners to build indoor courts.

A four indoor court, traditional build is roughly half a million pounds per court. It could be more if you have parking and lights. The funding that is available is nowhere near that. Somebody needs to come from an area with a passionate resource and idea that they want tennis. We need to find a way of putting in lower-cost indoor structures.

We're putting in a trial at Broadwood, which will be three courts. That is a different price point, so it's one you could look at funding.

I've probably been talking about indoor courts in Inverness for five years. I've been talking about the Judy Murray centre for a lot of years, too.

Both Murray brothers, Jamie and Andy, have been critical of the Lawn Tennis Association recently

We would like to leverage the money we have with local authorities so that for every pound they put in we get a pound or two, therefore it can make a difference.

I don't disagree with the lack of indoor courts in the country but we have spent a lot of money on courts. We've been into schools and get them enthused. We then take the kids and train the teachers and make sure they have somewhere to go. There has been about £5.4million invested since October 2012, so that's a significant amount of money.

In Glasgow, in the first six months of the year, 46,000 people played in the parks. That's up about 200 per cent over a couple of years. When we do it well it works. You don't want to put in a nice shiny new park with nothing there, so we need an infrastructure.

Judy, Andy and Jamie have said we need better coaches – I 100-per-cent agree with that. We have to start making the coaches feel they can have a career in tennis and a base.

We've 15 of the top coaches working with the players on a regional basis – Glasgow, Edinburgh, Stirling, Aberdeen. There are good quality sessions. But that's a start and we need more.

It's OK to say we should have this and that. But someone needs to work out where do we want the money to come from and how are we going to fund that. When local authorities say they don't have money – they do have money but it's up to them where they spend it. If they choose not to spend it in tennis, then that's a problem. We would speak to local authorities and make an attractive proposition. But we need land and someone to run it.

The Murray brothers play against Belgium's Steve Darcis and David Goffin in the Davis Cup doubles

It takes time, of course, but could more have been done earlier to build on Murray's success?