Well if you are in VMC & not using the ADF for anything useful, you can tune that into quite a lot of commercial radio frequencies. Eg "Capital Gold" on 1548m. Then just select the Indent, but not so loud, that you can't here ATC.
On the other hand, if you are like me, you already have it tuned in, for use as a VERY unofficial NDB (but don't tell the CAA), as the transmitter aerials are very conveniently placed about 3 miles east of Elstree aerodrome
