Where to send Cartier Tank for service.

[Watcha]

Chaps, My Wifes Tank Francaise (quartz) has been steadily loosing time over the past few months. The job has just been upgraded to urgent, as she has taken to wearing one of my watches until its fixed.

So who would you recommend for the job. Assume it just needs a new battery and a dusting.

Not keen on high street or AD's, rather a nice Indi with a good reputation.

Thanks.