Oh KitKat - nightmare scenario
I realise I'm preaching to the converted but the Housing Association need to step up and take responsibility in this situation. As you say, they are in sole control of who buys your home and they should have done their due diligence far better than they have. I can't believe that VSC have been accepted without a mortgage in principle - or at least an agreement in principle. Can you make a complaint?
In a way I sort of hope that they are turned down by company 3 so that you/your EA can dump them and start again with couple 2.
I think programs like Location x3 are responsible people thinking that "cheeky" offers are the way to do business Pixie. I hope your viewing today goes well.
So sorry to hear that things are still not going well Lazy
How long do your purchasers have left for their mortgage offer? At least your solc. has now drawn up the waiver - fingers crossed the mortgage lender agrees it. I hope you get some progress soon.
OneMoreOne and Artus - 6/7 weeks sounds like a long time but I guess the wheels of land registry move slowly and if a query is raised early in the process it doesn't really impede progress too much. I hope you both have a smooth journey to completion 
Thanks therealreason. I hadn't really considered the mortgage company before my solicitor mentioned about working for them too, but it's obvious really as they have such a huge interest (in our case at any rate!) in the property.
Our EA rang yesterday to say that the purchasers search will be back on Tuesday and they are not expecting new enquiries to raised as a result of it (this was my worry) so hopefully we will be able to exchange by the end of next week with completion during week commencing 22nd January. Yay!