Apologies, let me re-phrase.
Luxair operate Q400s into LCY. SAS used to. Flybe have in the past flown Q400s into LCY. Several of the current fleet remain approved for the steep approach.
The point I made was that the poster was wrong when he/she said the Q400 wasn't within LCY limits. The aircraft is approved to fly into LCY. I don't personally believe flybe would begin operate it into there however.