Thank you Altransit and hello Redvee! Thank you for replying.
I've checked again and grabbed a passing neighbour to double check it so I wasn't missing anything. The side sliding door has a handle to open the door from the inside - nothing to lock it. It wasnt a minibus it was a commericial van so I'd guess thats why theres no lock on the inside?? And the back door just has a small lever to pop the door open. This works to open from the inside even when the van has been locked up completely from outside at the drivers passenger door. But again no lock function on this. So the only way to lock the van at present is by inserting the key into the drivers door and all doors have to be closed shut in order for that to work.
I will organise a fob key - that seems to be my only option - I priced it at the weekend €250 to get it and have it programmed - was hoping there was another way around it but doesn't look like it unfortunately
Can I ask Redvee, when you lock yourself in with the fob key - what happens if you move about a bit - does the alarm go off?
Thanks again for replying !!