Breitling watch battery replacement recommendations

I have a Breitling Avenger, which is a quartz watch. Breitling at St James Quarter wants 140 quid to change the battery, which is crazy. Looking for a place than can COMPETENTLY do it for a REASONABLE price and the service is local. Timpson wants 95 quid and I need to send it away so that's out on both fronts.

Anyone able to help?