Outright - but although it's on the market there has been no interest yet and I don't have a deposit as such but should be able to pull something together for this at least.

Presumably therefore, you need to sell the other house first and you shouldn't have any problems getting a mortgage for the outstanding amount on the new one. If the place you're planning to buy is your dream home where you intend to stay for a number of years, you could consider dropping the price of your existing place to ensure you get this one.