I used them a couple of times and although the car was picked up and delivered in a good state and within the agreed times, they always use the passenger pickup area instead of paying Heathrow Airport to use their Off-Airport Parking area. This is not just dodgy, it's illegal and you could end up with a fine. Better avoid and go for a more reputable company that uses the appropriate facilities.
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Happy Days Parking | Heathrow Airport Parking