The Maclaren Techno XLR is a lie-flat buggy and is apparently suitable from birth. I moved DD into it at 3 months and she was happy, though we still had the head-hugger and never pushed it fully upright. From about 6mo she's been sitting fully upright and using it as a normal buggy.
However I wouldn't say it was ideal for a newborn in the pushchair mode. It just doesn't feel quite as stable and snug as our pram did, and is more exposed to the elements. Also you can't see the baby without leaning forward and looking through the little window, which I wouldn't like with a tiny baby. But I've since discovered on here that you can buy a carry cot that attaches on to it, effectively turning it into a pram and providing more protection, and the carry cot will face you, rather than facing forward. I'm definitely doing that with any future DC.
Failing that, I would look in to getting a cheap or second-hand pram and then upgrading to a pushchair at a later date. Its quite interesting, a lot of a mums I know bought things like the iCandy and Bugaboo and now the babies are 8, 9mo they keep commenting on how light and easy my Maclaren looks compared to their pushchairs, but having spent a lot of money they don't feel as though they can upgrade.
(Ps - where in the country are you? I have a Graco Quattro Tour Deluxe sitting unused with the carrycot but without the carseat, its a bit of a tank but incredibly stable for a baby, I'm never going to use it again...)