Rent increases that include bills

General Discussion

Hi there. I have a flat that is rented inclusive of bills. With the massive increase in utility costs, the actual amount I'm receiving has fallen significantly. The term of the tenancy is about to expire and I want to put the rent up, and understand that I can only put "rent" up once a year. What is the definition of "rent"? Can I have a rental amount of "x", let's call that "rent" and a "Utilities Supplement" of "y", so that x doesn't change in 12 months, but y can based on potential increased utility costs during the 12 month term(with all info provided to tenants as all bills are passed on at cost)?