UK bike fit?

[Mako]

Hello, I've been reading, just recently about how a "pro" fit can improve your performance on the bike.

What is a "pro" fit, and how do you know you've got what you paid for?

I had a 'quick' fit on my new bike at the LBS, but I've been left wondering what a 'professional' fit can offer.

Does anyone have any experience of a bike fit in the UK, or any advice in general? I apologise if this has been asked before....

Any help would be greatly appreciated