You could, but it would take you an awfully long time, because you are going the wrong way. You would have to go right round the earth, a journey of about 24,000 miles, and when you eventually get nearer to London Heathrow, you will be approaching it from the South.
About 5 hours.
From London to Newcastle is a very long distance
Commercial would be around 1 hour 20. Private could be 1 hour 5. NUFC :-)
With no changes, from about two hours 40 minutes to three hours 20 minutes, depending on the specific train. (You will arrive at Kings Cross station in London.)
1 hour
Big ben
The flight would be 21 hours long.
To travel by road from Newcastle to Gosford, New South Wales, would take around an hour and a quarter. The distance is 90km.
2 hours by car
A flight from Alicante, Spain to Newcastle, England would take about 3 hours to complete. There is about 1,150 miles between the two locations.
14 hours and 52 minutes