Thanks guys for the advice.. it’s on a turn so definitely needs to be ramped for H&S (and to pass the risk assessment!). Two options most commonly suggested by people are:
1.Large sheet of wood going right over the kerb and over the other side (creating a ‘curve’ up and down), painted with grippy paint (not sure what exactly though..is there a product, or do I just mix sand and paint?), then nailgunned into the tarmac. Removal via crowbar
2.QUick dry cement made on lining paper, made into a small ramp a few hours before.
Both have their positives/negatives. Just need to test both I guess! At least I could re-use the wood the following year, and prepare it in advance.