In the items above should be items where the bills are not entirely separated between your main business and personal activities.
If you have any bills that are entirely separated for business purposes, then these should be claimable in their entirety, and outside this calculation. Examples of these bills could include:
Separate line internet line in your home for business only
Separate line telephone line in your home for business only
Purchase of wholly and exclusive business equipment (i.e. business only computers, printers, stationary etc...)
Any itemised invoices from your cleaner that separates the business rooms from your personal rooms
Note - if you are trading via a limited company the contracts and invoices should be in the name of the company, not you personally.
Please remember that you can only claim the interest portion your mortgage excluding any portion of capital repayment for the loan value.