equipotential bonding

If you mean supplementary bonding, the 15th edition brought it in iirc. around 1981. It ddint last long, RCDs pretty much brought about its demise, it is still relevant without RCDs, but if the house is fully RCD protected, then no need for supplementary bonding.

I probably mean the main gas/water bonding, whatever the proper term is

The scope to omit supplementary bonding on fully RCD protected installs was not introduced until the 17th edition (2008). EEBADS (now ADS) was IIRC fully included in the 16th edition (1991)

Note I have seen claims that bonding requirements may also have been included in some of the electrical supply regs that predate the 16th edition - I have not been able to verify that yet.

Sorry, I'm talking late 60s and gas/water bonding to the MET

Certainly in the 14th edition (Reg D.10), but that doesn't answer when it was first introduced. 14th Edition lasted for 15 years via many Amendments, and I don't know if it went right back to the original 1966 version, but I wouldn't be surprised if it did.

My parent's house built in the era of the 13th Edition regs did not have service bonding (until I added it). It could be that it didn't conform to the regs of the time, but it probably did as it was using PVC cable and earthed lighting circuits which weren't mandatory, and MK wiring accessories which weren't the cheapest, so it was probably a good installation for its time.

My parents' house in question was built in the era of 14th edition, it does have PVC cables, with suspected green goo, never needed water pipe bonding as it is plastic, didn't have gas pipe bonding until relatively recently (covered by minor works certificate by the boiler installer)

Lighting circuits are earthed (all sleeving is green rather than green/yellow) and the similarly all fittings were old style MK with vertical arrangement of screws, most still in good condition (a few sockets had a rather weak grip on plug pins) so also a good quality install in 1968.

Still on wylex board with fuses.