Thanks for the answers

With some difficulty removed the rear trim to access the CLP - there was significant water pooled and have since dried out everything, thanks for pointing me there.

Interestingly, the indicator lights stayed on with CLP removed. The day after I reinstalled it the functionality of the passenger side indicator returned, and the day after that both sides are now working. However, I have lost the functionality of my central locking system now.

There was a very small amount of corrosion visible on the CLP that I could try to clean up? Central locking switch in car doesn't lock or unlock doors so not a key fob issue. I am also concerned I did not put the three yellow wires with grey connectors into the same slots on the airline manifold - I realise now I could have simply disconnected the manifold.

Also, I have replaced the radio head unit with an aftermarket radio - radio display works fine

but there is intermittent sound as with previous OEM head unit. Photo attached of removed unit for interest as there was visible damage. Do I check fuses, or check the connection to the amp under the floor?