I am from Eaac we own 5 747 classics, we are based in Bournemouth and so are our a/c, the 747's do struggle getting in sometimes.
A 747-200 can land (empty) on 5500feet.
747 flights are not notamed at all, although if there was any particular risk your airfield may consider it.
Looking in our Jepp manuals Kemble isn't in there at all, the landing would be visual and the approach would be at the captains discretion.
A 747 flight crew would be kept up to scratch on different class airfields, kemble doesn't really have any catagory.. but for example LGW is a Class 2 there are 3 catagorys (think 1 being easy and 3 being hard!) In other words, no there isn't any special training required for this type of flight.