Hi CharlotteCH. You aren't Charlotte Church by any chance, are you?
Thanks for your response. I hadn't thought how the electoral roll would be laid out but in view of what you've said and thinking about it now, I know from my role as polling officer that the electoral register we use is in street order.
In this case, that's not a particular problem because although I'm not certain where Sidney lived in the village, South Croxton comprises only four streets now and in the 1920s would have had slightly fewer houses so it won't be a huge task to search through.
I'd prefer an on-line version if there is one for ease of access. I guess a paper copy is likely to be held somewhere in Leicester which will require a visit.