Online agents get paid upfront - even if you take a credit agreement out with them the credit company pays them upfront. Once they have your £800 up front they couldn't care less whether your house sells or not as they don't get paid anymore whether it sells or sits on the market for years.
A bricks and mortar estate agent only gets paid if your house sells - so they have every incentive to sell it for you.
A bricks and mortar estate agent only gets paid if your house sells - so they have every incentive to sell it for you.