Yep, 5w ERP.
I once sat in a barbers in Luton having what little hair I still have cut. A radio was playing what I believe was R1, I didn't recognise any of the music so it probably was. Often aircraft RT could be heard although the barber said 'it's the police again'. From what was being said it had to be 121.270 (TC NW)
Wouldn't happen on a Roberts.