there were two levels of information provider (ip) – firstly a "main ip" who rented pages from post office telecommunications (po)/british telecom (bt) directly, and thus owned a three digit node or "master page" in the database. this required an ongoing investment, consisting of a minimal annual payment to become an information provider. the price of this basic package was £5,500 per annum in 1983, equivalent to around £25,000 as at end 2014. the charge includes: