As far as I can see that looks ok. Blackbirds (like this one) have a ring starting with L (I'm currently using LK+ numbers) and there should be 5 numbers.
Curious one this, BTO rings fitted to Blackbirds have contained 2 alpha and 5 numeric characters for some years now. How about LE43028?
I'm reading it as LE453028 ?
It is quite clear from your excellent pics that this is LE43026. You can report it on www.ring.ac and add in a link to the images when you do so, which will enable the ring to be marked as verified by the BTO when they process your recovery.
HTH
Phil
I would add that oblique views of a letter or digit can be very misleading as shadows and highlights come into play. In this case, things aren't helped by the ringer having put the ring on 'upside down' making field or photographic re-sightings that much harder.
It is also an advantage (as a ringer) to be able to compare images with rings from the same series, as the relative position of the serial and the address stamps are then apparent. Just to confuse things, I've even seen series (of BTO rings) where different versions of the same numeral have been stamped on the ring - in one case a 6 with a short top (as normally used) mixed with a 6 with a longer curved top used in the final digit position! Once the manufacturer sets up a production run, this can affect up to one hundred thousand rings.
Phil