Honestly, your accountant should sort that out, regards percentage of usage. For me, I tell my accountant each year what I pay in total for each item you mentioned, he goes & works out the percentage I can claim. Broadband I put all through as I would be on a much cheaper option if I didn't have a business at home.
In terms of receipts I put through, the broadband is a monthly bill, so he gets that receipt as normal with any other expenses. Petrol I do keep receipts but he just gets the full bundle at the end of the year & he works it out, no VAT can be claimed on it. Rest I put what I pay bi-monthly/yearly as a figure only....no receipt or anything.
My accountants are a firm & straight shooters, nothing gets claimed unless its business. If I need new car tyres, I'm allowed claim for 2 only, so 50%! I just let them do their thing, that's their expertise!
You have most if not all of the variables mentioned. All other expenses will be specific to your own business!