Bob,
No EHP like the mighty pussycat, you could run all services off the APU and SPS system, but as mentioned, with wings swept the APU exhaust would impinge on the back end of the inboard pylon and missile if fitted, along with the flaps.
A handily placed shovel more than makes up for this as a useful efflux deflector though!
Although both No1 and No2 Hyd systems could be operated off the APU, Wing Sweep took a fair bit of Hydraulic grunt, so when moving the wings off the APU, if you didn't take things very slowly and gingerly, it would often cough out in disgust and things would go very quiet!
As also mentioned, with ground crew generally crawling over any aircraft in the hangar, without a full fuel load in the front, the C of G could get a bit tail happy, although with its Cell 'O' the F3 was much less of a problem than the GR when it came to this.
Flipflopman