Freelance marketers UK... what are you up to?

Vague question, but only to capture attention.

I've recently been invited to a group of companies and wondered if people have any experience or interest themselves in joining such a group? The benefits are great - if one company can't do work for a client, they'll naturally pass on to you. You look like a bigger company. Discounted services should you need them for a project. You still get to own your own company, so nothing really changes on that front.

Thoughts?