Where to look for a cheep road bike

Hi im new to road biking im a mtb rider so im after spending no more than 300 quid on a bike. Any help as to what to look for and where to look would be good. Im 5'10 - 5'11 so what size bike would i need thanks
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For your height you could be anywhere from 54cm to 58cm depending on the above plus other factors.
Best thing is to go and sit on a few and get someone to look at your position etc...
As for size then I'd agree with smidsy, best thing would be to go to your lbs and try a few different brands and sizes and get a feel of what's comfortable.
Whyte Coniston
1970 Dawes Kingpin
Kinesis Crosslight T4
If you want the peace of mind of a new bike and customer service, a guy at work just got one of these http://www.decathlon.co.uk/triban-3-id_8167038.html
Apart the heavy wheels I can't fault it for the money. Wheels are something you can upgrade in a few months anyway.
As for size, try before you buy is critical. It is not a case of 1 size fits all, the frame geometry is completely different between manufacturers. My brother recently bought a new bike, after trying a few it was between a 56cm Trek and a 53cm Pinerello, so completely different sizes between different frames!
Search YouTube for "Bike Fit" so you know what to look for. Then go and sit on any bike before you buy it. Preferably take it for a test ride (not so easy if you are buying from eBay).
Winter - Trek Madone 3.5 2012 with UDi2 upgrade.
For getting dirty - Moda Canon