JoshuaX It's hard to say without more detail. If they are essentially the same "type" of businesses (e.g. they are both garages or they are both car dealerships) then one policy for the organisation will be adequate. The reason for this is that the arrangements will be similar enough. Then, as you say, the risk assessments can be shared (within reason of course). If the business are very different (i.e. the hazards are very different) say one company is a car dealership and the other is a construction company, then I would suggest having two policies would be the best course of action. I hope that helps.

Joshua/Ashley, I would just add that if there are two companies sharing risk assessments, policy, etc. the name of both companies should appear on the documents. This is simply so that in the event of a serious accident, there is no risk of claimant solicitors/HSE, etc. claiming one company does not have policies, risk assessments, etc. Regards. DJ