Greetings gang. Just to set the scene, I now own a 1987 GB250 Clubman grey import, great fun, has managed to release a few remaining 'moments' from this 75 year old carcass. The indicator relay failed last week, a genuine replacement being available in California at an unbelievable price. Thinking outside the box, it's no different to a car unit, 12volts, 2 x 21watt bulbs plus idiot lights. I looked on the website of my LED bulb supplier (Classiccarleds), and they offer a unit which has done the job, it will cater for filament or led bulbs or even a mix of the two, the flashing rate stays the same, and costs £8.25 + VAT. After completing the task, I then looked at the 400 and thought hmmm, ordered another unit plus 4 LED bulbs, straightforward swap over of units, just plug and play, and if you are nimble with you fingers the unit will fit into the existing rubber housing for the original. Bulbs were all replaced, and WOW! They're good. Hopefully might help somebody with indicator issues. Stay Safe. Mike.