£12.50 per injector isn't bad with £10 return postage. looking at £60 all in.
R-tech does it for £100 plus return postage i think.
If you go onto the link above, it has a typical post cleaning data sheet at the bottom, so they basically do the same clean/test as R-tech.. i have 4 injectors that need cleaning so if you go for this option, let me know what it's like.