Thomson 757 G-OOBN flying TOM55X Tenerife - Glasgow squacked 7700 just east of Belfast and made a very steep descent from 34000 (when I saw it) right down and landed immediately on 05 (normal ops were on 23) it disapeared from FR24 around Glasgow so I assume he landed (shuttle took off about ten mins later on 05 so I think it must of been able to taxi off the runway and to the stand) I think it must of been something with pressurisation because he made a very steep descent (I clocked it at 4000f/m at one point according to FR24)