Post Office Telephones, as they were before privatisation (can you remember the green Morris 1000 vans they used??), used to advertise using Buzby - a big fat yellow cartoon bird who would encourage us to 'Make someone happy with a phone call'. His voice was provided by the great Bernard Cribbins - also of 'Wombles' fame. He was quite a hit with kids, but they didn't pay the phone bills so eventually he got replaced. Gone but not forgotten!