I noticed yesterday(the 13th, maybe that explains it

) that the east midlands departures sounded (couldn't see anything due clouds) a bit low.
I live under the B4 FL105+ and usually dont hear or see EGNX arrivals/departures. i know that the daventry SID completely avoids the city of leicester and passes the west of it. I was on the east of the city during the afternoon(1300-1500) and heard at least one aircraft every 5-10 mins.
I'm just want to know cos i fly spamcans out of Leicester EGBG.
Do east mids departures(airliners) sometimes fly out of CAS?
Every night (around 2300hrs) i noticed a low flying airliner (landing lts on) flying westwards over the city(possibly towards SAPCO) at no more than 5000'ish. Might have been hard to guess the exact height but its loud enough to drown out conversation.
I also saw a Turboprop fly over leicester EGBG at no more than 3000' (Overhead for EGBG is 2500') a couple months back.
I'm not alarmed

, i just want to know if i should be extra vigilant for jets.
The other option could be that an airliner was doing touch and goes at leicester

.
Capt. manuvar