Thanks Ratbag and David for your responses to my recent post - actually it's been quite a while since I was on the forums so missed checking.
If I had 6 months with no races on the horizon I would have carried on as I'd been going, but as I don't have that time to play with and have started Shades level 2 marathon plan, I'm just keeping an eye on my HR (before I didn't use a monitor) to make sure easy runs are easy , etc.
I know my 2 months following Hadd's principles have given me a good base for what's to come, and as that's all I can really do for now I'm happy to take that benefit.