I grew up in Northolt in 50s and 60s and I have vague recollections of Radome equipped Connies visiting Northolt too.
I have wonderful memories of various types visiting Northolt during those years and spent many evenings down by the A40
US Navy Connies with radomes were regular visitors to the FASRON 200 base at Blackbushe until 31 May 1960 when the government of the day abruptly closed the airfield as a 'ministry' airfield thus stopping all this traffic even though it wasn't public transport so the ones you saw may have been the ones displaced by this action. The US Dept of Defence had only 3 years before built a hangar capable of housing these Connies and had proposed funding the building of a longer runway, but the government wanted to force operators to use a then under-utilised Gatwick along with its poor weather record compared to Blackbushe.