Earth bonding fresh shire power installation

[aquaholic]

I am at the stage in the project where I will be installing a 240v system on the boat and I realise there has been much said about whether to bond or not, but if I do would it be ok to earth to an anode on the hull which also connected to the engine or should I look to bond somewhere else.

Also am I right in thinking that I should make the earth before the consumer unit or can I earth direct from the unit?

Thanks