I'm looking to find out the legalities on volunteers working for a company that has yet to be registered as not-for-profit. Is this legal? I've heard that it isn't but just looking to do a bit more research on the subject.
Hello sambo182 as I understand you do not have to register with the Charity Commission, until your charity has a minimum income level. More info is here on the Charity Commission website.
As for volunteering, there is not a lot of law which governs volunteers - so there is no required legal form that your group/organisation needs to take before involving volunteers. Where it gets messy is when you start treating your volunteers in such a way that they might be construed as workers or employees. More info about this can be found in Volunteering England's very good publication Volunteers and the Law.