However, not every 'high street' or 'prime' lender will be able to offer you a mortgage because of the default, but there will be more than enough lenders (including sub prime) willing to offer you a better deal.
As has been said go and see a whole of market adviser and be suspicious of anyone who automatically tries to put you with a sub prime lender.
Hope this helps.
HTH
SS
The important thing I found (I also have a similar sized mortgage and have just finished my discount deal) is that by the time you pay the admin fee to end the old deal, the arrangement fee for the new deal, and the admin fee for ending the new deal any saving you make could be tiny!
I am going to sell in 12 months and worked out that if I sell in 10 months I loose money, 12 I break even and its only if I keep the house for longer that the fees start to even out the savings. Obviously this depends hugely on rates and what the admin fees are with your current deal but it gives you an idea, I hope.
HTH
G
PS you might get more help on the mortgage free board.
If you go to see an Independent, Whole of Market advisor they can search every mortgage out there and find you the best one to suit your personal circumstances and the fact that you plan to move next year.
You can find one by putting in your postcode at http://www.unbiased.co.uk/personal-finance/mortgages or there's a couple here too that will be able to help you.
We've got an IFA and there's no way I'd trawl the high street when we've got everything we need in one place