On here is a thread about buying on e bay a new flasher relay with an audible sound. I bought one for c £15 & it is a direct swap.
Works fine.
My relay is under the bonnet I think.... Would I still hear it?
I'd like to give it a try as it sounds inexpensive and easy - I shall see if I can find one!
Found it, bought it. I shall report back for other Roadster owners once it's installed.