I recently upgraded the bulbs of my 7, not the headlights but all the others: indicators, stop/tails, fog and reversing lights with units from Classic Car LEDs.
All in, eight bulbs and the new relay the indicators needed, delivered (after a 5% discount code I found online) was circa £75.
Eaiest job ever, the bulbs are direct replacements for the incandescent ones. The difference is significant - much faster lighting and much brighter.
After the weather we had in Spain/Portugal, I am sure anyone behind me will appreciate the difference if we find ourselves in similar circumstances.
The parts list is here: