Thanks all for the welcome, lovely!
The mainstay of my collection is the component regiments of the Royal Anglians and yes I do include the Beds and the Hertfordshire Regiments. Aside from a few collars and titles it's all cap badges or HPCs.
I do have some Cambridgeshire Regiment badges as well. In fact I bought a lovely Suffolks and Cambs yesterday.
Never really thought about the Rutlands or Huntingdondonshire Regts. As to period if I could I would prefer now to focus upon pre-WW1. However in all reality I am losing confidence in buying anything of that era through general lack of knowledge, they're all too expensive for mistakes to be made. Hopefully that's where everyone here can help
I do love books as well and so I'm just as happy buying a book about badges and my collection here is also going well. I don't yet have Chris' book on Anodised badges, perhaps a chrimbo pressie if Santa's listening and I've been good enough ;-)