Don't let Rene hear you say that's Greek! The roundels are inverted compared to Greek Blue-white-blue. It's a post-war Finnish MkIV Series VI.
There are one or two in that collection that I've got my eye on... Thanks! It's terribly difficult to find decent photos of Blenheims, in fact. For such a widespread aircraft, not many decent photos have emerged, and as a result, the profile painters are all feeding off each other. That's even clearer when one gets it wrong and the others all follow suit! It's something you really do need to be aware of. Among others, the worst offenders to date tend to be the French Histoire et Collections 'Planes and Pilots' series, where in some books whole pagefuls of profiles are untrustworthy or outright wrong. They didn't do a Blenheim book, thank goodness!
Actually, you've got one there - MkIVF Z7513. It isn't 'R', it's 'B'. If you look hard enough at the original photographs, it's pretty clear that the arch of the lower 'leg' of the letter is wrong for an 'R'. But at least the artist hasn't given it the 20mm cannon it is reputed to have carried, despite the fact that no photos of this modification exist, and the ones which claim to show it are clearly doctored.
I haven't found a single one with SEAC markings, probably because by then the MkV had largely replaced the MkIV, even there! I don't know what date the red was removed at - even if you don't go as far as using the 'Oxbridge' roundels - but all the photos I can find of MkIVs in the Far East have standard markings. Which means that even if you find one, you don't realise...
MkIVLs are indeed MkI airframes with pre-production MkIV noses. 68 were produced before the definitive MkIV entered production, but as I can't tell you exactly what the visible differences were...