best buy for a newbie at £600?

Hello all, new to this and would like to know your opinions. I'm sure there have been many posts like this and I apologise, but can anyone recommend any good bikes for under £600 for a newbie? I've been looking at the Trek 1.2 and the Giant Defy 3 which look nice. Any recommendations on where to buy? Thanks a lot
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That's assuming his employer does a cycle to work scheme.
@mattbeedham