Andrew M
The older cordless telephones which some people still use operate on 1.5-2 kHz / 47-48KHz. The Base can be heard on a MW radio.
As for your neighbours baby monitor on 14 MHz, it should not be there, but around 49-50 MHz, or the new ones at 900 Mhz or 2.4GHz.
271KHz could be a harmonic as most of these units are very dirty at close range.
The quoted Rx distance for these units of up to 300 M is only for the Handset to Base station. The Base itself, with both sides of the Tx could be heard up to 3.5 KM with a half decent communications receiver.
Having said all that there is a lot of illegal import stuff around which does not conform to UK regulations.
Listening to any of these transmissions is illegal.