McDuff,
Graham Wardell was the first RAF pilot on an exchange tour on the F-117 but he was not the first foreign/British pilot to fly it (2 had flown it in 1986)
H Peacock,
For a given pitch rate in the upward half of a loop, any roll introduced before the vertical up line will reduce the apex height (just geometry). The correct technique, as you have said, is to reduce the pitch rate whilst rolling (or even to maintain a pure up vertical line) and then the apex height will be the same or greater. However, in the Shoreham accident it appears that maximum instantaneous pitch rate was maintained throughout the upward half, including during the roll. Appendix H of the report covers this.