Ok.
I'm being stupid. But getting confused.
Our mortgage is £150k
Our house is worth £300k (ish)
We want to buy a house that's up for £390k.
Say our house sells for £300k how much more do we need to borrow?! (i've managed to convince myself that I've got £300k for the house, I can keep the £150k mortgage and simply have money left over but I'm sure that's not the case!!!)
And how do you ensure you have enough cash left over to pay the stamp duty, the solicitors fees and the moving fees?
Can someone put this in idiot's language for me please :)