First of all I'd like to point out that PEC training on the AVX does not require any program at all unless you want to average the data of several worm cycles. When turning PEC on the mount starts moving RA until the worm index is found, so no need to wait for one cycle. Great discussion about the software here, but it seems like all overlook the basics! Did anyone post a comment about what star to use? Next to the celestrial equator, at a dec near 0° is the answer and in the south because it should be high in the sky. UK is pretty much in the north, so a higher dec might be better. You should select one 30° above the horizon at least what ever dec you end up at your location. You should also check if the air is calm and the stars are not twinkling too much. For the first attempt I would use the mount controller and select teach PEC there. After some 10-20 minutes it will say "Done". Auto guide as you always do. If that is with PHD2 and a computer it is fine, if it is with an autogider it is also fine.
As always check the result! To avoid any software confusion there is an old school procedure for this as well: polar align your mount and then intentionally change az by about 1°, that is twice the radius of the polar scope circle if you have one. Now set your camera to lowese gain/ISO 100, add a NB or ND filter if you have and take an unguided 30 minute shot with PEC on and one with PEC off with one very bright star in the image. The star will drift up or down and the trail is your PE curve. Take a sharp and guided shot for plate solving to determine the scale.
I did autoguiding and PEC enabled and it helps. Reason being, the PEC know what is coming up next and correcting right in time while guiding is always correcting what as already gone wrong.
Using software and averaging curves for an AVX is really waste of time. The mechanics of this mount is poor and each turn of the worm will be different because the big gear is also uneven. Unless you have extremly low polar error the dec axis needs corrections as well and the famous stiction of the bushings (not bearings) in the dec will ruin it all plus the backlash will ruin any image near the zenith. I have been fighting the shortcomings of that mount for a year and now added little money to upgrade to the EQ6-R frankly admiting what a fool I was investing so much time in the AVX. You learn a lot but you won't tune this mount to decency level.