Mathepac
From the TAB Guide 2009 by Jill Kirby the wording used is "where both spouses are working" therefore I would have felt that pension income is not deemed to be a working income. Why do you think it is?
Its an income, not wages or salary from a "job" or "work". I have no idea of the context of your quotation, but suspect it may be connected with personal or joint PAYE tax-credits.