Protective bonding conductors in a flat?

[alanl]

I've just been to a flat tonight to look at some potential work, but there is no bonding conductor to the incoming water pipe inside the flat.
I had a quick look in the main distribution board cupboard of the flats, but could see no evidence of bonding to the water, and the main water incomer to the flats is hidden away anyway.
So, should there be protective bonding to the water in each flat?
Or, is one bond enough between the main block of flats Dist. Board and the water incomer for the flats?
I'm presuming not, and it will need some 10mm put in, but would like others thoughts on this.

Thanks
Alan.

 

[spark 68]

Here are the actual pages 1SC,

The pics may help you.

Cheers,
S68