The 'globe' logo would indicate it being no earlier than 2003.
I hadn't really taken that in. Well spotted, thank you.
Apart from recognising that the "capital T in a circle" would date from no earlier than 1980, I have no idea when the "piper" was first used nor when it, in turn, was replaced by the "colourful globe". Wikipedia (remembering that it a best effort and not a definitive source) states 1980 - 1991, 1991 - 2003 and 2003 onwards, respectively.
Attached, for those
kitizens who would like to know, are three images from the
Ringing Generator 2A booklet (which can also be downloaded from
this link).