Pocket watch repair

[hops]

My Bensons pocket watch has broken and I would welcome recommendations for a repairer in the Surrey/SW London area ideally. I don't wear it a lot but wind it up every now & then to keep the movement going and last did this a day or two back. This morning on trying to do the same the winder spins without much resistance and I suspect maybe the main spring has failed. In the photo the two silver cogs turn when winding but nothing else. I would appreciate your recommendations folks and maybe a ball park figure for repair. It's not been serviced for around 4 / 5 years so probably needs an overhaul to.

[MADDOG]

ALSAL Watches, 226 Strand, Temple, London.

I have all of my watches for the past 15 years or so repaired by Tim and NEVER had an issue. I would highly recommend them.

[walkerwek1958]

Definitely sounds like a broken mainspring, that could be replaced without stripping the whole movement. I'm not volunteering, I don't work on pocket watches although this one does look straightforward.

[hops]

Thanks gents