"Good morning Anthony,
We all would like to thank you so much for the outstanding service we received from your company during our UK visit. The drivers were so pleasant and always on time. They contributed a lot to making our visit most enjoyable.
Thanks also for helping us with a transfer to Heathrow even though we booked rather late. We were going to take the train but then decided at the last minute to use your taxi instead. So glad we did!
I will certainly recommend you to everyone travelling to the UK.
Have a lovely day.