L J R
I posted from memory, having enquired some time ago. But I have an undated purple 'glossy' at home called 'AFPS - Your Pension Scheme Explained' which confirms what I thought. I think it was issued within the last 5 years, but before last year's changes, and relates to the 'old' pension scheme: I kept it because I stayed on the old scheme.
It is not as authoritative a reference as a current, dated regulation but I think it is still right. Hope that helps.
Greg