You must have a day off, be bored or spending a very long lunchbreak to come up with this one. Anyways, because it's you Paul.
626 km (what that is in miles, go and figure out yourself) using the Hook of Holland-Harwich ferry, so that takes me about just under 8 hrs. and about the time I need to spent on the ferry with a couple of drinks.
Or ...
860 km (dito), using the Eurotunnel and passing the himes of the southern rags on my way down that'll take me also just under 10 hrs.
I'd rather prefer to fly over from Amsterdam to either Manc of that place where it's full of dippers trying to steal your wallet. That'll take me about 6 hrs in total, including the bloody waiting at the customs where everyone needs to take of belts, shoes and any juwelry in case we hide a bomb.
Btw, are you still living in that same shit**ole that cost me EPS 35 for a taxi on boxing day? :)