It wasn't so long ago that we, in England, were doing sort of the same thing - installing bonding to the copper pipework internal to the property, when there was a plastic incomming service - I don't think anyone ever cut the plastic pipe to insert a copper bit? Certainly all the way through the naughties the bonding had to be in no matter what.... hence why we saw silly plasic pipes bonded. (For new or restored supplies from the suppliers.)

Its only rather recently that we are specifically allowed to leave the bonding out if the incomer for the gas and water is in plastic. I've not dealt with the suppliers and new connections on a property with no bonding; I assume they'll connect up now with no bonding in place? 

I've not done domestic though for a decade or so may be behind the times and "not so long ago" might mean more than 10 years ago. 

It wasn't so long ago that we, in England, were doing sort of the same thing - installing bonding to the copper pipework internal to the property, when there was a plastic incomming service - I don't think anyone ever cut the plastic pipe to insert a copper bit? Certainly all the way through the naughties the bonding had to be in no matter what.... hence why we saw silly plasic pipes bonded. (For new or restored supplies from the suppliers.)

Its only rather recently that we are specifically allowed to leave the bonding out if the incomer for the gas and water is in plastic. I've not dealt with the suppliers and new connections on a property with no bonding; I assume they'll connect up now with no bonding in place? 

I've not done domestic though for a decade or so may be behind the times and "not so long ago" might mean more than 10 years ago.