I have LED's in main & low beams, plus LED spots and fogs. The main & low (both canbus) are just straight swaps with no extra looms etc. The fogs and spots are Lazer ST2's and the main & low are "Twenty20". All can be had at Auto Bulbs Direct (ABD)
The Lazer's are not cheap but they were no cheaper anywhere else. I got these after trying numerous ebay offerings that had various negative issues and were a waste of money.
The Twenty20 LED's are good quality bulbs that cast a clear, bright white light, no blue tinge at all. The low beam cut off is good too with no issues of lighting up the backs of other cars. They are also much less money than other offerings such as Phillips.
All other external bulbs have been LED's for a good while now, I did get a relay for the indicators from ABD that ensures no issues with canbus recognition, the only thing with it is that you don't get the audible indicator click in the cabin. As long as your auto cancel works then that's not a problem.
As with others above, I've never had a problem with MOT's. Hope this is of help. Keep Well All.