There are two relays on the right of the bulkhead in the engine bay. Both look the same but I can't read the part number off them. The lefthand one got smashed during an engine swap and as a result ther lights don't work anymore!
It's the part number for that relay I need
Bear in mind that most voltage droppers will draw a small amount of current so if the vehicle sits for long periods between use it will run the batteries down - as I found out! I have fitted a switch to disconnect the droppers when not in use.