My indicator switch seems to be a little tempremental. When I first go out on the bike it takes a few tries to get it to indicate left, indicating right is not a problem. When signalling left, I can hear the relay making a noise but no indicator lamp. After 15mins or so it's fine. Any ideas?

check the bulbs, look for loose connections, worn out connectors/wires. check the fuse for good measure....
get a can of contact cleaner and spray inside the switch while wiggling it, leave to dry.
then spray the switch with WD40..

try it now

Thanks leopard. Will give it a shot and report back.

Thanks