No they just did a bit on moonlighting.
Prior to the big wages of recent years most players had a 'day job' as the £20 a week they would receive was not enough to secure a future.
With the maximum wage in operation until the early 1960s, it was not the best time to be a professional footballer. Some, like Tom Finney, continued their former trade (another plumber), others secured a future in Journalism such as Danny Blanchflower. It was a precarious life as a professional footballer. Jimmy Hill went on to become a trade union organiser with the PFA before moving into management and later broadcasting.
Many ex-United players suffered this after Munich when Busby sacked them as they were recovering from their injuries. Even worse, they were evicted from their club houses and found themselves Homeless and redundant.
A lot of ex-players ended up running pubs or scratching a living.