Thanks for your replies. I've decided it must be the seal - I think the spring coming off is the most likely scenario as I didn't use an insertion tool.
As I need to fix it this weekend I don't have time to wait for delivery of a tool so unless I can borrow one from a main dealer (extremely unlikely) I will make one on my lathe based loosely on the one in the link.
I will try and post some pictures once the nightmare is over!!
Thanks again
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