Wotcha and welcome - there are a few more options if you are willing to travel - particularly Warwickshire / Telford way. Given there are a couple of approaches to mapping some can take longer than others - A generic flash will cost less, not take as long and not be bespoke to your motor ( it will cost a lot less but you run the risk of you engine going pop) but a bespoke map with some dyno then road time will take longer - also ideally you should be able to have the car tested for cold start post map - means leaving the car overnight though.