jonathang,
There are amended charts already prepared for the next AIRAC cycle, effective 30th October - not sure when they will be issued.
As far as lanes etc - there are none, however the zone - from surface level stretches as far as approx 7 miles to the SW, Irvine to the NW, and approx 10 miles to the NE/SE.
Beyond that to the East are 2 stepped portions bases 4000 & 3000 respectively, South it extends to Turnberry, bases between 2000 & 4000 feet, and finally to the west 5 miles beyond the edge of the Zone, beyond the zone the base is 1500 feet. It does make sense when you see the chart !! It is slightly more complicated by having 7 different portions, and base levels (including the zone). But as I said before, just give EGPK ATC a call and they will provide any help needed.
Hope this helps !!
Cheers