LED indicators

[Stuart Giles]

And get a decent dynamo

You'll certainly be  needing that.

From "The Road Vehicle Lighting Regulations 1989" section regarding headlights

© A motor vehicle with four or more wheels first used before 1st April 1986:

30 watts minimum

The document wouldn't count as a rattling good read, but the section on position lights -i.e. sidelights said there was "no requirement" as regards wattage for these  in schedule 2, part 1, sub para 8. perhaps that's contradicted later in the document.