This might sound like a stupid question, however I am flying from Heathrow soon for a day trip however the schedule I have arranged requires me to drive rather than catch the train (which I usually use for Heathrow).

I have parked at Gatwick on lots of occasions in Long Term for a day however the baa website will not price a 1 day only stay for Heathrow which therefore makes me dubious.

If I did park in the Flight Path Long Term (or Business Car Park at Terminal 4) at Heathrow for only a day, would they charge me, for example six days parking anyway or is there really a daily price (e.g: £7.90 like at Gatwick)?

Any suggestions gratefully received - I really don't want to pay almost £40 for 15 hours in short term parking!