Hi Sued. Maybe best to post under all things menopause. You might get more responses.
Anyway,  
 
Your consultant doesn't appear to be giving you the full picture.Provided you have no medical reasons to come off HRT and are aware of the risks, there is absolutely no reason whatsoever in coming off it because of length of time you've been on it or your age. Have a look at the Nice prescribing guidelines. 
Sadly it's not unusual for many GPs to not have much of a clue when it comes to HRT but I would have thought that your consultant would have explained any increased risks to you or maybe even discussed restarting it and trying a lower oestrogen dose longer term. 
It's a misconception that you are starting afresh. The symptoms button doesn't get totally reset when you come off HRT, the symptoms ( if they come back ) would be the same as they would have been if you had never been on HRT in the first place.
Anyway, unless there is a compelling medical reason to come off it, or restart it, there's no reason why you can't stay on it as long as you're aware that risk factors increase slightly  the older you get. 
I'd go back to the GP and get back on it pronto. You can maybe then decide at a later stage to tweak the dosage. X