Well, having decided on Malta and investigating the prices availability etc I contacted the dive centre in Malta.
Still too early to tell her indoors I thought, that is until the dive centre called this morning after I had left for work to discuss my "booking". 
Next thing I get a call asking why the news of the trip has been broken by a stranger in Malta.
Not to worry all booked now for May and a call to Thomson confirmed that we get an extra 5kg allowance as divers.
It's a shame they didn't tell us before the last trip to Cape Verde.......
I've heard of the Thomson book in staff not knowing about the extra allowance, has anybody else had that experience?
Rob.   

Just had a long conversation with a fellow North Sea diver.
He told me that he went out at the weekend and got 4 meters visibility, but the water was only 4 degrees.
Having got me all excited, it turns out that the only correct information was the water temperature. The vis is still dreadful. 
In light of this I am now looking at a warm dive holiday somewhere.
Rob.