Interesting, got confirmation from worcester today that my proposal was fine, furthermore , no requirement for the plume kit, as long as exhaust is usual away from surface , and other clearances are met as standard.
Tamz, I will put that wall pic, up for you, so you can see what I meant, took a while to get the angle of photo , I think the labourers thought me mad, I also tried to show the old press and the two window nightmare !
I will put them up once I have done next estimate!