My estimates, based on Yellow Card summaries and EU export records, suggest that the 10m viable-but-yet-to-be-used doses are.
4-5m Pfizer
4-5m AZ
~1m Moderna
NB: acceleration is independent of this split - even if they were all AZ, there are still second doses to catch up on.

— Paul Mainwood (@PaulMainwood) June 21, 2021