@ester We didn’t, just employee a new one and they contacted old one and got the paperwork from them directly. We went through two in quick succession which I was worried looked bad, but have been with current one for a number of years.
Limited v sole trader depends on how much your turnover is. We started out as sole trader, then went limited. We pay less tax as a limited company but more accountancy charges so if the turnover was quite low we wouldn’t save anything. A good accountant will know which is best.