Very happy chappie, excellent place to park for Heathrow Airport being right next door to Premier Inn Hotel where I was staying both pre and post flight - 50 yards walk. May I suggest that Purple Parking could display a prominent sign in their reception area to remind people from outside of the London area to pay the ULEZ/LEZ charge within 3 days to avoid a penalty notice charge. I had previously googled this and was wrongly informed that the Airport Terminals themselves were within the ULEZ/LEZ ZONE, but not the hotel and car park. A reminder sign to that effect could be useful.