Tag F1 Chrono battery replacement Surrey/London

[Wildfire]

Hi All

So I have a battery workhorse of a Tag Chronograph, given to me by a friend a couple of years ago (he got a new one and my watch had died). Anyhow the battery has just gone and when asking at Goldsmiths they want rather a lot of money to do a simple battery change.

As far as I can tell it's genuine and it's been my daily wear for the last 2 years.

Can anyone recommend somewhere for me to just get a battery change that isn't a Timpsons or somewhere where I'm going to pay more than the watch is worth?

As above I'm in Surrey/London if area makes any difference.

Cheers