I just found it very strange as for the fact that on the outward journey yesterday, the pilot kept us very well informed of weather conditions and let us know that it would be fairly bumpy up and out of Stansted.
Also the seatbelt sign was turned on just before T/D, just like every other flight i've ever been on..
Maybe this pilot was just having a bad day! :P
And as for the turbulence, im not saying its was at all severe - I just happened to see a young child fall over because of a rather nasty bump, and with my judgement (for what its worth) I think the seatbelt sign should have been turned on.