If you are flying via a London airport then it can often work out far better to stay in London the night before/after your journey especially if your journey is a long one. Of course if you do this then you need to consider how you are going to get to/from airport. You can just ring a mini cab or hail a black cab when you are ready but a far easier and more efficient way to go about this is to get a company that specialises in airport transfers to help you out.
By hiring a company that deals with airport transfer needs you can be sure that they have a good knowledge of the airport so there will be no confusion as to where to pick you up from or drop you off at. These companies are also booked usually by the flight details, which means that if your flight is delayed then they know and can adjust the pickup time accordingly. It is important to remember that not all of them do this, so you should check all services before you decide which company to hire.
Different airport taxis offer different services and also have access to different types of vehicles so when it comes to comparing between different companies to decide which one you would like to use, dont just take price into account.
Also when it comes to searching for a company to use for your airport transfer, it is important to remember that there are airports all over. So when you are searching out a company to use a search phrase such as airport taxi is going to be relatively useless to you. Instead what you need to do is add in the name of the airport or area you are search for. So for example London city airport taxi is going to give you far better results if you are searching for a capital city airport taxi company. That way you know that any of the websites shown are going to be able to help you, so you can then begin to do your research and compare between the different options that are available to you.