The UBC125XLT may show it, but it has a 25 kHz AM bandwidth, so it will pick up anything within about 12.5 kHz of 120.7083.
Show you will likely get 120.7 and 120.7166 as well.
It's not impossible that you could hear aircraft approaching Lydd, but you'll loose them as they descend.
Approach frequencies tend not to be repeated within several hundred miles.
Birmingham Approach freq 118.05 is re-used for Oban for example, but that's 315 miles away with big hills en route!
Check out Flightradar 24, it shows flights for the airport, e.g. one due 12:30 Saturday.
You might possibly catch a handover from London control on 135.325
I'll monitor 120.7, and let you know if I hear anything.
119.375 is Lydd Tower. You're less likely to hear that as the aircraft will be lower.http://www.nats-uk.ead-it.com/public/in ... d=147.html