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Equipotential bonding dilemma!

geov
I have an issue on which I would value your opinions.

I’ve been conducting EICRs in a building developed over the 16th, 17th and 18th centuries, more castle than domestic dwelling, though it is now providing around 20 flats. The properties were rewired in the early 80’s. I’ve found a number with no MEB to incoming water or gas or both. The issue is that the cut outs and consumer units are, without exception, the opposite end of the properties from where gas and water enter the properties.

It’s a listed building so nothing can be run externally, floors are polished hardwood ( not sure what vintage) and ceilings are ornate plasterwork.

Although all were rewired under one contract, many have had electrical alterations and additions since, except bonding. That said, the typical set up is a MK board with an up front 80A, 30mA rccb with 3871 type 2 mcbs for the domestic circuits, along with a separate off peak board serving storage heating. In the flats which have had gas installed, some of the former off peak circuits are now  radials with socket outlets with no rcd/rcbo protection.

Readings suggest PME/tnc-s supplies, a few have PME stickers.

So, to my question - is there any way I can address the lack of access to install bonds to water gas ( leaving aside ripping up historic floor boards or getting copper services changed to plastic)? Innovative, whacky, off the wall suggestions welcomed as are technically sound, difficult ones!

TIA
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    Having re-read, each individual flat has DBs/ cutout  at opposite end to incoming gas/water [ to flats ].

    There may be a wacky solution.... Making an assumption original water service is one incoming pipe then branching to 20 differing locations [ flats ] and it is continuous metal.  Use this as protective bonding conductor for whole building. Somewhere you may be lucky that a cut out position is not too far away from this water pipe, so you you could make a sort of building earth marshaling terminal with a suitably sized earthing conductor, route and aesthetics permitting. Then, with even more luck, the incoming gas and water in each flat are fairly close, so make and bond between water and gas. Non -standard, but a possible solution.
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    Having re-read, each individual flat has DBs/ cutout  at opposite end to incoming gas/water [ to flats ].

    There may be a wacky solution.... Making an assumption original water service is one incoming pipe then branching to 20 differing locations [ flats ] and it is continuous metal.  Use this as protective bonding conductor for whole building. Somewhere you may be lucky that a cut out position is not too far away from this water pipe, so you you could make a sort of building earth marshaling terminal with a suitably sized earthing conductor, route and aesthetics permitting. Then, with even more luck, the incoming gas and water in each flat are fairly close, so make and bond between water and gas. Non -standard, but a possible solution.
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