Looking very nice Calum - good luck at your first event!

I had an inkling that that might be the type of actuator you had, as I have the same one. I havent used mine in a robot yet but when I tested it out I seem to recall that it had a clutch system in it, in which case you shouldnt need limit switches to restrict the travel. Have you tried it out in your robot going to full travel? And does it try to continue to push or does it stop of its own accord?

Having said all that, its been months since I tested my actuator so I could be mistaken