Firstly thanks for your input.
I know we can catch the train, take the National Express bus, but both of these options do not work for us. So we are looking at a fixed price taxi transfer.
Our flight is 'supposed' to land at 6.00pm Terminal 2. I know we can book a taxi transfer for approximately 100 pounds which is OK by us.
But: What happens if our flight is delayed? I can book the taxi for approximately 7.30pm-8.00pm but as you know flights can be delayed for 2+ hours. We are also flying Asiana Airlines, they are known to be late.
Also if you can give me a preferred company - I have tried the link to ethical taxi and it goes to a shopping website.
Your comments would be appreciated.