"I was going to Heathrow airport. The driver arrived just before time, was extremely helpful and I arrived at the airport in plenty of time. Great service. Many thanks.
Just noticed below about leaving a tip. It would be useful to state when booking that this option will be available after the journey as I gave the driver a tip at the time.
Also, if I'm entitled to vouchers, please donate the value to the charity as I will be based in Australia. Many thanks."