Interested to know what the average detail includes and also what level of cleaning and polishing etc you should be doing in between? A couple of us have been talking about our dissatisfaction with the service that we have received from Permaguard and are weighing up the arguements for/against continuing to return to them annually...
The london crew don't seem to be of the same standard as Graham up in stockport (re PG).
The only problem you'll have (minute as it is) is the PG treatment will need to be removed before the detailing process takes place - so they'll need to do a two stage claybarring i'd imagine.