When you find yourself in an airport, getting to your destination provides three different solutions. A bus is the cheapest one, but the quality is directly proportional with the price. You get what you pay for, so you better get ready to face a crowded bus and no room for your luggage or friends. Buses will not leave you in front of your hotel either, unless the hotel is located in a bus station. Therefore, arm yourself with water and patience because you will probably need to carry your bags for at least 15 minutes.
Renting a car is not the wisest idea either, especially if you come from a country where cars are driven on the right side of the road. The British drive on the left, so it takes some time to get used to switching gears with the left arm or going through roundabouts. Besides, you should have a clue about where to go. The costs are quite high too, as well as the insurance and taxes required to drive downtown.
Finally, it looks like booking the London airport transfers at airportstransfer.com is your best solution. Just get a big enough car to accommodate everyone inside. If you travel with more friends and you got plenty of bags, you might be able to get a van waiting for you.
When cost efficiency makes decisions for you
At a first glance, taking a taxi looks like the most expensive option, but it is not. In fact, it is actually very cost efficient. The more people are riding along, the lower the costs become. The entire cost is split to everyone. In other words, you might be able to pay the price of a bus ticket for the comfort from a taxi. What else can you ask for?
The same taxi transfers are just as handy when you explore the British capital. Think about the costs associated with parking fees, fines, downtown taxes, insurances and gas if you somehow want to rent a car. While they do split too, a taxi is still a cheaper solution. You do not even have to worry about where you park the car, not to mention about worrying that other drivers might hit it.
If you are not sure about your options, just weigh their pros and cons and come up with a decent comparison. It is easy to realize that a taxi is ideal.