He rose through the ranks of the TSSA to be an Assistant General Secretary (one of two, at the time), and in 1989 he was elected General Secretary of the union (i.e. in day-to-day control, but answerable to an elected Executive Committee of lay members, and to the Annual Conference).

During his time at the TSSA, Rosser was also a magistrate and was Chairman of the National Executive Committee of the Labour Party in 1997–98.

[2] Following his retirement from TSSA Rosser was created a life peer on 14 June 2004 as Baron Rosser, of Ickenham in the London Borough of Hillingdon,[3] taking his seat in the House of Lords on the Labour Party benches in the summer of 2004.

Rosser served as an Opposition Whip and Spokesperson for the Labour Party on defence, home affairs and transport at various times from 2010.

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