Crap article, it even mentions GLA when VS don't have slots for them.
The slots can
only be used on EDI and ABZ so not sure where the article is getting that from.
Talking of VS what sort of frequency can we expect?
Theres only 7 slots available so not much: maybe 2-3 for ABZ (with 3 on the busiest days) and 4-5 for EDI?