As long as your journey from London to Newcastle on foot.
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.
From London to Newcastle is a very long distance
About 5 hours.
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.
2 hours by car
To travel by road from Newcastle to Gosford, New South Wales, would take around an hour and a quarter. The distance is 90km.
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