Thank you all - I'm sorry for being miserable, it will pass I'm sure. 
Nessa I'm like you, I hated having to move from my last house. I adored it but was just too small for us all. So the move to our current house was a purely head move, no heart involved. It was to get more space and was to be for 5 years. We've been here 6 years now and I still don't like it. There's nothing wrong with it, it's a perfectly nice house, it's just not the house I want (now I sound like a spoilt child!)
I can't help with moving costs I'm afraid although they don't sound bad to me for a full packing move. EA told us it would be about £2k for a house our size in this area.
I think we want to move now Lazy because DP and DS have fallen in love with the house we want to buy and where the vendor is waiting for us and being so patient and accepting. It's logically a bit unsound but it's unique, gives us more space and if we lose it we won't find anything like it again. I'm rather more "meh" about it than DP and DS though. I would prefer to move a bit further out of the home counties and get more space for our money. We are also on SVR mortgage now (as our new mortgage is with a different provider) which is costing us about £350 extra per month and I'm unwilling to carry on with this indefinitely. The final driver for soon is that we have to apply for secondary schools next Autumn so wanted to be in situ by then. Frankly, if we lose this house then DP won't want to move anyway and we'll take a new fixed rate and hunker down. Do some stuff to this house instead and then move when DS is older. It wouldn't be the end of the world 
Thank you muss
I just sometimes feel silly stamping my feet and demanding to move with no real, tangible reason.
Fingers crossed you can complete by the end of the month Lazy
Things at least seem to have moved on from last week when you thought you might have to break your chain.
pulling - crikey, it's like buses - nothing for a week and then two emails in one day. Hopefully this is the start of the end of the process for you.
I will stop moping now - I blame having a stinking cold and the coffee machine breaking down this morning 