Turns out the bed bug problem is a lot worse than we thought. The pest control guy sprayed half of our room where the bed is (I thought it odd that they don't do the whole room). A week later I was in the dining room where we have been storing all the things we didn't want to be riddled in bugs and couldn't treat (i.e. silk kimono's, expensive waterproofs and feather jackets, sentimental stuff including photo's and my wedding bouquet) when I espyed something suspicious dangling from a cob web (this place is seriously grotty!). On closer inspection, it was revealed to be an adult live bed bug. This then prompted me to scan the skirting boards where I found literally heaps of cast skins, dead bugs and their assciated waste. To make things worse, one of the jackets we put there for safety had one on it. We have now frozen the jackets at -4oC for 2weeks as that should kill any eggs. The silk items I will probably try freezing and see what happens - there's nothing to lose by trying.
The dining room must have been the original nest source and it confirms our suspicions that the previous tenents were sub-letting and using the living room and dining room as bedrooms. It certainly confirms that we did not bring them to the house due to the sheer number and state of decay of the dead ones.
Oh yes, the washing machine is leaking water too, and as I have to wash absolutely everything we own on as high a temperature as the garment/backpack etc. can cope with, this is not welcome news.
We also found out that our letting agent instructed pest control to do the whole house, what we got was half a ruddy room. He isn't impressed either!
Grrrr!!!!