Hi Denise, we used Frank Gelder's company too. It's part of a larger company that does cars in London, but has recently branched out into Kent.
The cost may be different for you, depending on the timing. Ours was £125, but that included dropping us in Canterbury for 3 hours, keeping our luggage, and then picking us up and taking us to Heathrow.
Excellent service, great driver.
