Bunnyfuller, welcome to the thread, and keeping my fx that you are able to exchange soon.
Mussins - good quote. I would snap that up quickly. Though I would lock them into an all expenses quote - so they do not suddenly realise that something else was not quoted for!
Gizlots - keeping my fx for you. I am currently living the exchange date dream through!
Pulling - also keeping my fx that the information is received quickly. The wait for a single piece of information can be frustrating.
Nessa, - Ouch about the 2 months unexpected wait. Seems like someone dropped the ball. My vendor is in a similar position to your buyer, in that they thought they were exchanging and completing at the end of this month. Their EA had not told them that the lower chain buyer had pulled out and we were now looking at exchange before xmas! It sounds like our vendor's EA, and your buyer's EA need a bollocking!
Lazy, - Me! I really want to move before xmas, or failing that, before this thread reaches a 1000. 
As for us, we are kinda in limbo albeit progressing well now.
Our chain is complete and the new buyer for my buyer has instructed solicitors.
We have also now had a builder look at the work that were highlighted on the survey report, and though the majority turned out to have nothing much to them, four things were picked up and have been quoted for. And the quote is upwards of a 30k! Not sure what to do. we like the house but not 30k out of pocket like.
The vendor is so sweet though and I am leaning towards saying sod it and lets have at it and take on the cost of the repairs?
What do you guys think?