Good budget. Difficult to go wrong in that price range.
Tips - you'll want an aluminium framed bike, with Shimano Tiagra or 105 gears. Other than that, find good bike shops, find one that fits, and enjoy it.
Aluminium - lighter than steel, but will have carbon forks at that price to reduce road buzz.
Shimano Tiagra and 105 have a mechanism for changing gear within the brake levers that allow you to do this when riding either on the hoods or on the drops. Which is useful.
Outside this, the Boardman range in
Halfords are well regarded, even if not every Halfords has the best bike service workshop or salespeople.