Exactly as others here, I also use trail / approach shoes pretty much all the time. I used to have a pair of (Brasher) boots. They fitted fine and are great boots... but couldn't get on with boots, kept slipping and felt the support was rubbish. Now use TNF Hedgehogs... Merrell Refuge Pro previously (even in the snow), I find much more support and grip as my foot sits in them better and can flex more easily. Again, get advice on fit and sizing if you can.
I also agree with others to get what you need now for now, get what fits and don't think too much about what might be. If you move to more serious winter stuff, get the more 'serious' boots then. (Eg I have Scarpa Activ SLs for B1 use and haven't yet gone beyond this sadly!!).
Welcome maskedmaverick. Best advice everyone will give you is to go into the shop and try on a pair of boots that work for you and fit you. If you pop into most good outdoors shops they will give you great advice for just the right fit. Maybe you should buy another pair of Burma Pro if they worked for you. Having just looked at the Mamook's it seems they're not really intended for general hiking. They are B3 boots so this means they'd be stiff (as designed for crampon use) and are more designed as their description says for 'technical winter and alpine climbing' so I personally wouldn't recommend them for UK hiking - probably too heavy duty esp in Summer! As I say your best bet is to get into a good outdoors shop and ask and try boots, shoes etc. to see what works.