I would definitely prefer a pressure washer to a weed burner any day of the week.
You shouldn't use a weed burner in dry weather and the gas is heavy to transport, plus should be stored carefuly.
Argos stocks various reasonably priced pressure washers. I was unlucky with a Karcher model that broke down the second time we used it, so can't advise it.
News blackout on Old Bailey Starmer arson case.

