For Heathrow Terminal 4, follow the signs inside the terminal building for the free shuttle bus service to Heathrow Central train station, where you can get on the Heathrow Express train. The shuttle service from Terminal 4 departs every 15 minutes and is a 4 minute journey.
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generally, yes, it means credit hours. but when in doubt, check with them. sometimes a U will have their own way of doing things. I'm just confused with it because on my unofficial transcript, it shows the hour and credit hour multiplied together to create the grade point.