The strike action taken in the early 1970s was everything to do with ATCOs. The reason union members went on strike was that that method of determining their salaries was scrapped by the Thatcher government despite having give assurances prior to the general election that the had no plans to interfere with the pay bargaining formula. I disagree with the assertion that the majority of ATCOs did not strike, some certainly did not and I have a lot of sympathy for those approaching retirement age who felt their pensions may have been affected, but all in all the action was well supported by union members.
