Thanks Nick - (but Opodo and LH both price it as a complete trip without needing to do the multicity thing) - I think I'll mark it down as one of lifes great mysteries.
Sometime this summer - it was still Teesside when I flew out of it in May - I presume they changed it to try and move it upmarket - shame about most of the clientele (although I could have just gone through at a very unfortunate time with a KLM and Ryanair departure at the same time, to DUB and AMS, both crammed full of stag and hen parties

)