I used them in July this year. LFT, CDT and Cholesterol.
No idea as to their accuracy, but LFT's were normal (part from something to do with a protein but they said that was unimportant.) CDT was 0.20% and Cholesterol was 4.4% with more good than bad cholesterol.
None of these results however will mean anything to the DVLA as they do not accept them.
If it's only an LFT you want, why not get your GP to carry it out for free?