A transfer from Heathrow Airport is necessary to get to Heathrow Airport. Taxi transfers are popular due to the proximity of airports, just 15 miles from central London, where most hotels and apartments are located.
Taxis on Heathrow are located at all four terminals. They are rigidly managed by airport staff. This is not like other airports, where it is free for everyone. Black London taxis are the only ones allowed and there is a fast passenger line. Ticket prices range from 47-54 GBP depending on the distance.
If you want to save a little on a taxi, you can book a taxi for Heathrow in advance. Many of these transfers to Heathrow Airport can be found online. It will save you around 20 GBP.
At Heathrow Airport, it will take 30-45 minutes to pass through the customs, so there will be a "waiting fee" and a parking fee for the taxi. The driver will be waiting for you in the parking lot and will meet you at the agreed place. The driver will be there, don't worry.
At 15.00 GBP, the Heathrow express train is probably the most expensive one-way trip. If it's your choice, a coffee machine runs every 15 minutes and takes you to London Paddington station in 15 minutes.
A cheaper alternative is the Heathrow combination. It makes five stops before hitting Paddington station and costs only GBP 9.50.
An even cheaper alternative is the London Underground. For 4 GBP you can't beat it economically. You will, however, make countless stops and it should take 45 minutes.