Re: I’ll believe it when I see it.
35 years ago '1984' was the era when fibre was used for SOME of the UK trunk networks, the idea of consumer fibre was still a VERY long way in the future. Big business got in the main 'Megastream' services normally over copper. 2MBps for iirc 20k per annum presented as a BNC coax using G703
Cable and Wireless, a long established international carrier were given a licence by Thatcher for a UK network 'Mercury' in 1982, initially as a figure of 8 network in England mainly laid alongside the mainline railway with short hop microwave or copper links out to customers, in either multiples of 64kBps or 2MBps
Later on in the decade the concept of broadband as a consumer service arose but it was still the thing of futurists, technology papers and conferences.
It was a monopoly DSL over copper BT wanted to roll out, for free, in exchange for sole rights over delivered content. Thatcher blocked that but it was after the likes of NTL/Telewest were established in some cities the UK. I'd hazard a wild guess of 1988/89 BICBW
As for the internet, from wikipedia
"Pipex was the United Kingdom's first commercial Internet service provider (ISP). It was formed in 1990 and helped to develop the ISP market in the UK. In 1992 it began operating a 64k transatlantic leased line and built a connection to the UK government's JANET network."