You're right to say there was no fundamental change, it was just a change in the way people were classified. After more than 20 years of being accepted as a Freelancer operating through a Limited Company via a recruitment agency the new rules said that I was actually an employee despite the fact that there was no minuted post that I was occupying and that the establishment was at full (normal) strength, so I was not sitting in a vacant job. I was just providing temporary capacity for additional work.
Anyway, I decided to retire rather than have all the hassle having completed more than 53 years of full time railway industry employment.
Big mistake on my part. I'm bored being retired, despite having the place in Spain all ready and waiting and being here in the nice weather, I miss the daily commute in to Waterloo. But, mostly, I miss the people I worked with, the camaraderie, the daily banter, the feeling that I was actually doing something worthwhile in keeping people safe whilst travelling on the railway. I've had plenty of offers from Middle and Far East but my heart is still with the UK and I may well return to continue my career there in the future, I'm not financially motivated, I have a good enough pension package, but persuading the wife may be a different thing!