Hi Pigeon
This is relatively easy and a more common situation than you'd imagine.
Your main 'lookouts'.
The best mortgage for you will have no 'High Loan to Value Fee' and no 'Redemption penalties'
From there, it wil probably be good if it had no booking/arrangement fee, but this would be a maths exercise to compare products with fees and without.
The rates for these products won't be fantatsic - 5.5%ish I'd have thought, so from there are two further ideas - can you scrape together a 10% deposit? It'll widen the options, although I daresay you'd need to check those options before seeing if it was worth the trouble. The other option is if you can plan on keeping 'House 1' for 2 years or more - then the idea of having redemption penalties for the 1st 2 years only would become acceptable.
There is a plan 4, looking at offset mortgages with redemption penalties.
Give me a call if you want to look at some figures, it sounds like alot to consider, but the 1st 2 rules narrow things down enough to make things quite simple.
Adrian Garside
01489 784022