Partial retirement and the Civil Service Compensation Scheme

Bearhop

I took partial retirement from my civil service job when I turned 60 last year. Slightly before I took PR I was moved to the Alpha Scheme. My new pension age is 67 under Alpha. 

My role is now being restructured and Voluntary Exit is being offered. 

I am finding it difficult to understand how my PR will affect what I might be entitled to under the scheme. I understand that my having taken PR will reduce what I may be offered but I can't work out to what extent. The opportunity to obtain a quote from MyCsp is months away, I have phoned them but they were unable to give me any advice. 

Has anyone on here any insight?