Sadly not. The particular case in point was pantomime. Artistes contracted for a specific production, with pre-determined start and end points, on a fixed fee "for the job". In every case, these particular people have what is know as a key artiste contract, rather than a supporting artiste contract, and invoice for the full contract price, which is then paid out in weekly part-payments. Historically, the production company (one of the very big ones) ha always done this for the people on the posters - and no deductions for tax or national insurance were deducted. The only exception this year was for those who trade as "Fred Smith Ltd". The supporting cast always had tax and NI as appropriate. Those who supplied UTRs would not have tax deducted, those without them would.
It cost the production company significant sums. Top turns frequently are limited companies, but by no means the majority. It also causes some book-keeping issues - in my own case, I raise an invoice for £X, but the payments don't clear the total. So you have to create a balancing payment for the unpaid proportion, which for simple people like myself, gets very confusing - and worst of all, because I've never claimed benefits, and hopefully never will, it really is wasted money. Ironically, just a day or two after hearing the bad news, Equity came to give a presentation to members of the cast who are not members, and they used this as an example of one of their triumphs - much to the annoyance of members of the cast who had seen in effect, a pay cut as the result of it.
My accountant was told repeatedly, this was a mistake, until she spoke to somebody who knew the exception to the rule, and confirmed it for her. The really annoying feature is that you could have a member of Stage Management on virtually the same contract total, who doesn't have the Class 1 deductions - my own son, doing his first work for the company, gave me his invoice to pass on to the office, and didn't get the deductions, while I did - and due to illness in others in the cast, spent far more time on stage than I did! So annoying!
I suppose the real problem is that most accountants are not experienced in this particular industry where self-employment is so common, yet up until now, we've had none of the special rules the construction industry, for example, have. My own sister is a tax inspector, and she'd not heard of this one, only to check and find it was indeed firmly in place!