where abouts are you looking? the market is becoming a lot softer at the moment so prices will fall... (though always depends on the area). if you take some types of mortgage that you can pay direct into any amount you can kinda have it both ways - keep on putting lots away which is paying it off/reducing interest but you can draw on the money...(i can send you details of some of them - things like rocket repay). have you owned before? (first homeowners grant issues) and will you ever live in it?
Also - think thru what you will be able to afford when you do come home mortgage wise...