After some help please gents!
Thanks for your responses so far, that's a really nice machine there sesteve, my mum had the exact same one so this is why I had to grab one when I saw it.
It's well loved but not in bad nick however, but if anyone has a picture of how the interlock mechanism should look underneath the spinner cowling I'd be very grateful, the previous owner has had this removed as it packed up and just held the lid down to spin. I have found a NOS part arriving next week but have no reference on how it goes together. I replaced one on a T5090 I had years ago so I know it's not to bad a job.
The other issue is the pump, it's a nasty pattern part job and leaks like a sieve, very cheap plastic body too and has had the pipes tightened up too much and the connection spigots are all out of shape. I know decent ones are like hens teeth these days bit if anyone had a spare or knows where I can purchase a decent replacement, I'd be very grateful.
I'm glad I have it, it'll be a cracking machine when it's working again
Cheers!