Thanks for the reply. I thought I was able to read and understand most financial/taxation stuff, but that quickly lost me. Too many words with I suspect specific meanings I do not know.
A forecast I got before the final letter awarding the EDP says I have used 57% of my (1.75m) LTA. So I guess I have triggered and used it, which is probably good, because I was concerned that I might have to apply 11 years of inflation increases before working out how the second lump sum features in the calculation.