Congrats Sausage - fingers crossed for a smooth process for you.
Science and Glizlotsmum you've both made me think. The house we're buying has a wood burner and an open fire. I didn't even think to ask if they were in working order but I will do now. Our building survey is next Thursday so I hope this will be checked as part of this anyway.
Glizlotsmum does your purchaser have an agenda? I wonder why they haven't organised their survey yet. Hopefully you will still be good to complete by half term.
Raaraa that sounds traumatic. Why the need to find £8k more? The last time we sold we had a git property developer at the start of the chain and the git decided to drop his offer by £15k but the EAs were great and managed to hold it together with everyone taking a £2k hit and the git developer only getting a £10k drop. I'm still bitter about how he manipulated the chain though.
Our process has been this:
Offer
Mortgage agreement in principle
Instruct solcs.
Mortgage valuation
Building survey
Searches
Our solcs told us yesterday that they've passed our "pack" to our purchasers solcs. and that they've had packs from both purchasers and vendors solcs. Hopefully that's a good sign. Just waiting for the mortgage valuation survey results now. I don't think it will be a problem but I worry nevertheless 
Is there any way the vendors would allow your roofing guy to inspect the roof while they are away Science? Can he do it from the outside or does he need to get into the loft/attic?