Hi Rob
Most lenders will be happy to lend more than usual to someone in your shoes and yes, up to 6 times income may be possible.
My suggestion would be that you figure out what you would be willing to pay on a monthly basis - this is more important at this stage as it will govern your borrowing in a more relevant fashion than old fashioned income multiples.
If you say you can afford, say £1000pm then I could look for the largest mortgage that you can afford at that price.
You might say, we can afford £800 now, but we could afford £1200 in 2 years, that again would give some figures to find a mortgage that fitted that scenario.
By all means give me a call, 01489 784022, I'll see what I can to help
Adrian Garside