Newbie to road

I am currently on a Viking road bike and have used for the past couple of months. It's not an ideal bike and very heavy and clunky. I am looking at upgrading as I am getting more Milanese in my legs and wanting to go further but feel this Viking is holding me back. I have a budget of around £300-400 I may be able to squeeze a few more quid out. Just wondering if anything you guys can suggest? I've seen a Merlin Performance PR7 Road Bike ever heard of this?
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Aravis Audax, Moulton TSR
Kinesis Racelight 4S
Specialized Allez Elite (Frame/Forks for sale)
Specialized Crosstrail Comp Disk (For sale)
Might be a tad over but nothing too fancy, but if I were you I would be saving up a bit more to look for better deals either second hand or some of the higher end aluminium frames...and if you are asking what sort of bike I would be saving up for in your place, here's a rough idea.
http://www.paulscycles.co.uk/m7b0s6p591 ... EFY-0-2015
The B'TWIN Triban comes in at your price range, although I'd probably opt for something second hand.
http://www.decathlon.co.uk/triban-500-se-id_8306187.html
The last thing you want to do is be stuck with something that's not quite right.
http://www.chainreactioncycles.com/cube ... prod127980
Cannondale - CAAD10