lawyers have a vested interest in you getting sued.
insurance providers have a vested interest in you avoiding liability.
I have seen a number of misinformed our downright bone-headed posts on CGN over the years, and I have done my best to ignore them or suggest polite alternatives, but this one is too problematic to ignore.
Lawyers don't have a vested interest to get you sued. Actually, if anything, they have a vested interest in trying to help you avoid getting you sued. This is because if you act on a lawyer's advice and things go sour, the lawyer himself could get sued for negligent advice and/or face disciplinary proceedings from the Law Society. Therefore, lawyers tend to be very conservative in their advice for this reason. However, because they are working for you, they will do the best of their abilities to find creative solutions and loopholes that could benefit you.
Insurance companies, on the other hand, are really only interested in making and keeping money. This means getting as much in premiums as possible and paying out in claims as little as possible. They don't care if they unreasonably prohibit you from doing an activity -- they're still getting their premium. And they don't want to potentially bind themselves to owing you money in the future if things go pear-shaped. They will not try to look for solutions with you; they will only try to look for ways to limit their potential liability for expenses. If that means shutting down your ideas for expanding your business, too bad. The only way they will work with you on this is if they can sell you an additional policy for more money specifically for this activity.
But to help you understand the basic principles of liability that might be associated with this activity, the only one who can give you a legal opinion that is backed by professional status (and insurance) is a lawyer.