JeremyR has given you good advice. Booking train tickets well in advance can save you a lot of money. I did a quick example online search, and found you could get a same day return train ticket from Nottingham to London for £36 on the 10th November (excluding tube fares). He would arrive in London just before 8am and would return just after 3pm, which would give him a window of about 6 hours to have his medical, and he would not have to stay overnight in London.
Transportation help
in United Kingdom
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JeremyR has given you good advice. Booking train tickets well in advance can save you a lot of money. I did a quick example online search, and found you could get a same day return train ticket from Nottingham to London for £36 on the 10th November (excluding tube fares). He would arrive in London just before 8am and would return just after 3pm, which would give him a window of about 6 hours to have his medical, and he would not have to stay overnight in London.
Hope this helps. Good luck with everything!