A suggestion: some time ago we discussed the characters' signs in the Chinese horoscope. Since these change every year, they could also suggest the age difference between the characters. For instance, if Blake was born in the year of the (fire)horse, and Avon in the year of the snake, as I recall we 'determined', what would be the difference in age between the two of them?
BTW, I think Blake's actually 32 at the beginning of the series. Blake et al. must have been fighting the Federation for at least a year before they acquired Orac. Then, in 'Pressure Point', Blake says he's been gathering information on Central Control - with the help of Orac - for about a year. These are two years to be subtracted from the age the clone reports in Weapon.
Which I find rather interesting, because Bran Foster says Blake was arrested 4 years before the events in TWB - that is, when he was 28. Presumably at the time of that first arrest he must have been the leader of the Freedom Party for at least one year, to become so popular and annoying to the Federation. This means that Blake was leading one of the most influential rebel groups on Earth ('the only one that really meant something', as Foster says) at the age of 27. This is rather young for a leader, isn't it?
N.