✔ 最佳答案
If your flight arrive London Heathrow at 1:30pm, assume there is a normal queue for custom and time for your luggages to arrive, you will leave Heathrow after 1 hour at around 2:30pm.
As the above user suggest, you can take London Underground. Travel to Central London from Heathrow by underground will take 1 hr. However, if you have large luggages, that can be a problem travelling in the underground. So I would suggest to take Airbus A1 from London Heathrow to Victoria and take about 1 hour too. This will be better in especially after 12 hours flight from Hong Kong.
You should have enough time to catch the National express at Victoria. Remember Victoria coach station is not the same building as the Victoria train station. It will take 5-8 minutes to walk there.
There are also quicker train from London Heathrow such as the Heathrow Express and the Heathrow Connect. But they stop at paddington and you will have to change London underground to Victoria.
For funfares ticket, if you miss the bus, you can still take the next one but may have to add additional fare.
Hope this helps.