So I posted a couple of weeks ago and thank you for your replies. I've since been monitoring closely and I'm still not convinced there isn't a problem. Husband thinks I'm mad as a box of frogs... I'm actually a psychologist by background so I'm pretty perceptive (I think, for my sins!)
Anyway, I think the only thing I can do is get a structural engineer in to look. At least then we will know what we are dealing with ... I know they sometimes want to observe over time but I'm wondering what a rough fee is (west mids) for a walk around inspection?
Needless to say after getting a RICs building survey prior to completion (1 month ago) this is rather disappointing....
Also I could alert our insurer but I really don't want anything related to subsidence associated with the house unless it's a big job that we can't afford to do without insurance intervention! We are insured... though we don't have legal cover at the mo. Not sure if we might need it?