Agreed, if you have someone working for you 3-4 days a week regularly then they are effectivley employed by you.
Self employment mean you have the freedom to work wherever you want and not be tied to any one business for set amounts of days per week. One way of proving that "could" be that they only earn a certain percentage with one company, I think 80% has been mentioned somewhere.
So question to rosyweb, does your "subby" earn another 20% of his total income from other places? (ideally not one other place). If all the money he earns is from you then even if that is only earned over 3-4 days a week then he is employed by you. He is not truely self employed.
Providing saws and PPE does not make someone self employed either. In fact some companies make employees buy there own saws/ppe. It come out of an allowance which is paid on top of the wages but forms part of the employment contract. ( I believe they get taxed less or zero on that allowance)
There seems to be big confusion over holiday pay here. Holiday pay is not paid on top of wages. You dont GIVE anybody holiday pay and you are not paying them for doing nothing. If you have someone working for you full (or part) time as an employee then they are entitled to days off. You then spread their pay over the entire year so they get a bit less each week but they still get it when on holiday. Its the fair way of doing it. Same as PAYE tax is paid from week 1 even though you dont really owe any until you have reached the tax threshold each year. After the first week of work the tax is worked out on the assumption that the person works at that rate all year, otherwise they would pay nothing for the first few months and then pay a lot for the rest. SO the HP is similar, you get paid a little less each week so that you still get some when off work.
So, the business owners out there who think they dont get holiday pay so why should the workers, then you are being a bit naive...... you do get holiday pay, its in every job that you do. If you go on holiday of have time off then that must be being paid for out of every job you do each throughout the year, so there is no reason why the people who work for you cant have holiday pay either all your doing is paying them for 45 weeks of the year but spreading the payment over 52, its not rocket science.
Of course the scary thing is keeping them in work, and I understand why so many (me inlcuded) dont employe poeple, but if knew I had the work I would employ two people straight away and leave them to it. Of course in return for that they lose the freedom to work for other poeple or do their own jobs.