Ok. Thank you for the replies.
I've given this a great deal of thought over the past couple of days and reflected on the responses to try and work out exactly what it is that is making me feel this way.
He's a good looking man and dresses well. Quite old fashioned in way - quite 'gentleman'ly. Always wears a smart jacket and a hat sort of thing. In that sense, he's not my usual type, but I find it quite endearing (not sure that's the response he'd be going for mind!) He likes the glamorous masculine/feminine aesthetics of the 1950s. He's in good shape for his age and was very handsome in his youth! I feel very proud to be seen with him. But I'm not sure he'd say the same.
On the other hand, I think that I am averagely attractive - I can look nice but I have a slightly 'hippyish' appearance and so I generally fall well behind him in the stakes of style and elegance unless I make a particular effort and, even then, I still don't come close! I'm a 12/14, erring more towards 12 but I'm 'soft' and rounded with curves in all the right places - not a slim 12. My body is definitely that of someone my age and who has carried, delivered and fed 2 children! I don't dislike it - I'm not body conscious and I quite like my softness, if I'm honest.
My experience is that men view me quite differently and, over the past couple of years, I've become far more aware and self conscious about the few lines I have appearing on my face and my lack of a 'sexy' body. This is largely because my weight (I'm currently at my heaviest) has been commented on, as has my age, as have my looks by men I've dated or entered into relationships with.
He doesn't criticise me but I know he appreciates it when I have made an effort because he clearly finds me more attractive then.
My biggest niggling fear is that he is embarrassed to be seen with me in public. I have experienced this before.
He's not very tactile generally but I'm constantly aware of how close he stands to me, how closely he walks beside me, whether he appears to be 'with' me or just sitting/standing next to me.
What I really want to ask him is if he is proud to be seen with me when we are out or if there is a little bit of him that is embarrassed. He's generally quite honest and a terrible liar so, even if he tried to cover it, I'd know. Because, at the moment, I don't feel that he thinks I'm attractive and that he is with me 'in spite' of what I look like.
That's not me putting too much value on appearances, just that I don't want to be with someone who is embarrassed to be seen with me.