Cant recommend anyone but go down the DIY route. In a day you can easily do a full detail to a decent standard and save some £.
1) Wash the car -- ideally snowfoam first
2) Use Iron X then Tardis to remove iron and tar particules
3) Clay bar - I used the new(er) clay mitts with a detailing spray, takes no time at all doing to entire car with the mitt
4) Polish - if needed
5) IPA wipe
6) Seal - I used turtle wax ice seal n shine - its very cheap easy to use and gives good results and very quick. Very well reviewed online. Or use a wax etc
Its
or go to
www.detailingworld.co.uk and they will know people in your area