I have a TN-S supply and there is a really old one-pole connection at the incoming main for the main earthing terminal which both me and my neighbour's earths are connected to - there's no room for any more cables.
Looking at the on-site guide and various other sources it seems to suggest that the (10mm) earth bonds to the gas and water pipes should be brought back directly to this main earthing terminal, but is there any problem, in terms of meeting the regulations, in taking them back to the earth block inside the consumer unit (to which the main earthing terminal is connected by 16mm cable)? Is this specifically disallowed?