GO for it. I use a local company here in NI. They dont just produce generic maps. Every map is adjusted for your car. I dont see how anyone can charge more than £250 for a map.
You get what you pay for, its as simple as that. I assume your local 'custom mapper' has full rolling road facilities, and spends 4+ hours testing, tuning and datalogging all of the required parameters?
The sad truth is that most maps that people buy these days are just bought from cheap websites or downloaded from discs bought on ebay by amateurs trying to make a quick buck. There are very few tuners tnat can create true custom remappping solutions for their customers, anyone that tells you they can do this by using nothing more that a laptop is either misinformed or using tne word 'custom' to make the product sound better in some way.
Tuning and developing ECU software is all about long term testing, measuring, analysis and alteration using the correct tools and by employing people with the knowledge to do so. Anyone can buy a read/write tool from ebay and buy files and call themselfes a remapper and charge £250. Once you add in a premises, staff, cost of running a business, expensive genuine tools and software, rolling road facilities, insurance etc..... You realise why they can create better software than a mo ile tuner working from the back of a van, and why it costs more for this premium product.