(Original post by happybuns)
I didn’t have my red number, just wondered if anyone had been through something similar?
As 999tigger suggested, just phone them up.
They should be able to identify your application without the number, it'll just be a bit more work for them.
You won't be the first person not to have made a record of the reference number; you won't be the last.
The risk is that someone might have intercepted stuff in the post. If that's the case, it needs dealing with sooner rather than later.