Paddington
There isn't one. The overhead railway goes to Slough.
Slough railway station was created in 1840.
Slough is closest to Heathrow airport in London.
About 30 miles.
Take a train from Ipswich to London Liverpool Street. At Liverpool Street, go to the tube station and take a westbound Circle/Met/H&C Line train to Paddington. At Paddington, go into the mainline station and take a westbound train that stops at Slough (it should be the first station the train calls at). From Slough, take the shuttle train to Windsor Central. At Windsor Central, leave the station and follow the signs to Riverside station, the other railway station in Windsor. At Riverside station, you can catch a bus to Legoland. Don't miss Windsor, by the way.
The London Underground does not go to Norwich, it only goes as far as the suburbs. Norwich has a mainline station with direct trains to London Liverpool Street.
London.
No, it's not. The o2 arena is in Greenwich, London, with slough being a part of Berkshire. You're not too far off though. Jump on a train at slough to London Paddington and hop on the tube. The whole journey should take you about an hour at most.
It takes 2 hrs and 20 min
14 minutes on the First Great Western.
West of London in Berkshire, near Windsor and Heathrow airport.
London Paddington station was created in 1854.