Self-employed vat

Hi all,

My sister has recently started her own business, she works from home and wants to know:

When she if filing her vat3 form, what percentage of her household bills, for example, phone and electricity, can she claim back for business use.

Thank you in adavance.

There are a number of threads on AAM already on this topic including
here and here

Sorry only getting back

Thank you very much for your help, had been looking around site, but couldn't pin point the one i wanted.

Thanx again Graham_07