Former service personnel retiring with a pension and then taking up employment as FTRS or CS. They get their pension and then start to build up a second pension. There are penalties and so on before 55 but after 55 you get the full unabated pension.
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Not unless the rules have changed recently! I served as a regular until age 54 and then 5 years as FTRS. Despite a popular misconception that the full pension is reinstated at 55, my pension was abated for my full period of FTRS service so that I only received the same as my equivalent rank coleagues from pension plus salary (ie Full seniority Sqn Ldr pay while in FO/FL post). I did however accrue 5 years extra pension.