There are no flights between London and Cardiff. The easiest way is to travel by train which takes about 2 hours or to drive (using the M4 motorway) which takes 3 hours. If there was a flight from London to Cardiff, it would be roughly 12 minutes long if flying nonstop at 500mph.
No, as the Tube (the London Underground) does not run outside the City of London. You could however use the Tube to travel to Paddington Station and catch a train to Cardiff. The journey would take approximately 2 hours if travelling during the day and may be of longer duration in the evening.
M1 and M40 - you could use either one of them.
It would probably be miles.
It depends on your car! The distance by road is about 200 miles and it is mostly Motorway so you could expect something between 30 and 40 miles per gallon. At 30 mpg it would be 6.66 gallons, at 40 mpg it would be 5 gallons.
I should think that driving in cities would use less petrol per year because one mostly drives such shorter distances. Still, the speedier motorway driving has the engine turning over very much closer to its peak power rpm's - the autocar will see much better petrol efficiency near the peak power point, so one would use less petrol per mile on the motorway.
There is a 3 metre radio telescope on the roof of Cardiff University. There is also an optical telescope at the site for the use of undergraduates.
There is no London code 274. London numbers have 8 digits and all start with either 3, 7 or 8. To call London from outside London you would use the London code, ie 020. If you are calling London from outside the UK, you would use +44 and then 20 followed by the rest of the 8 digit numbers.
The only airline that operates the Cardiff - Amsterdam route is KLM: Royal Dutch Airlines
Well the easiest way would be to use the London Underground. If it is imperative to use a train there is the London Overground Network. A link to the Underground/Overground rail network can be found below.
London & all GB cities...
The new motorway junction had an overpass so that the vehicles did not have to stop now.