Depends on lots of things.... you need to consider:
How long has it been on market? What do similar houses in street/area sell for? What is your position - are you chain free/cash buyer as that is very desirable. What did vendor buy house for (check on land registry site)
In the absence of any other info I would say 570k is too high as it is almost at asking price and i think vendors usually assume your first offer is not your best!!