i was wondering if any one could help me identify the position of the "trailer signal" or "trailer indicator" light, and also a brief description of what this looks like. many thanks.

its my understanding that when the sockets are fitted (genuine only) the warning is intagrated in to the bulb warnning system

I was thinking that too.

Mine has a buzzer.

its my understanding that when the sockets are fitted (genuine only) the warning is intagrated in to the bulb warnning system

I think so too.

On my car with originally mounted detachable towbar, i get a message in the maxidot if a bulb fails. And it actually told me that it was on the trailer it failed!!

I don`t know if there are any other warning systems in UK.

ArvidG