I stopped and spoke to them this morning. The bloke I spoke to was Irish (couldn't see his name badge) and he seemed to think that having the Perry Vale gate open between 16.30 and 19.30 every day was quite enough to meet their "health and safety" obligations.
He also said that this was a tactical move, and that the long term plan would be to have more barriers and a ramp on the PV side. I may be mistaken (and he did squirm a bit when I asked him to quantify "long term") but this might start within 6-9 months.
As far as I am concerned, this all sounded pretty credible. To be fair to the bloke, he was pretty much shrugging and saying "we appreciate this isn't great, but it's the best we can do" - and it sounded like they've been using the old canard of "health and safety" as an excuse to actually do something, rather than the other approach of using it for inaction.