Thanks Remus. The 6a looks reasonable enough but I wouldn't spend any more on a phone as it'll most likely die being dropped when riding, or being put down a manhole at work to photograph something, or an accidental swim in a reservoir (or another similar ending etc.).
The Sony Xperia 10 V looks like it might also be a viable option as the aspect ratio makes it look like it'll be fairly easy to handle with one hand.