Leave it with a friend or relative.
707miles
train, car - by car you pay a fee to go in, taxi, coach
The best way is to take a train from London to Paris and then change to the night train which runs direct to Venezia San Lucia Station. But this is also the most expensive way to reach Venice. The cheapest and most common way from London is with a cheap airline like RyanAir or EasyJet flying from London Stansted or London Gatwick airport direct to Venice San Marco or Venice Treviso airports and then taking a connecting bus or waterbus into the city of Venice.
There is a little Venice in London, one in Michigan and one in Baveria, Germany
Go on a train
Take the M40.
it depends your own opinion
The driving distance from London to Venice is 950 road miles on the A4 - about 15.5 hours driving time.
about an hour
The Eurostar does not travel between Venice and Milan. It goes between Paris and London.
London to Gloucester takes about 2 hours 15 minutes by car - according to Google Earth.