Probably not Gareth. I've followed this for some time now. Initially a UK convicted murderer claimed the ban breached his HRs. The ECHR agreed. This latest decision is by the so called Grand Council.
It appears that the ECHR has no mechanism for changing it's mind, so HMG appealed to the GC.
Nearly all EU countries operate some form of ban, thus placing the ECHR in the awkward position, for them, of how to get out without looking complete idiots.
Personally I do not recall any EU government ever saying NO to the ECHR, many states have ignored them, but not actually telling them that they won't comply.
The last Lab Gov ignored them so the problem dropped into Cam's lap. The House voted with only 22 against to tell the ECHR where to get off. Hence the ECHR's problem.
Few alternatives exist for the ECHR, turn a blind eye is about all they could do, so they have to look for a face saving get out. Thus they have stated, via the GC that anything BAR a blanket ban is acceptable.
In Cyprus, for example, ALL prisoners retain the right to vote, provided that they are not in prison on polling day!!!!!
In Strasburg they stack the BS several stories high it seems.
Roy.