Payment of Pension Contributions For Company Secretary Without Salary

Client ltd company employed the director and the company secretary( salary £25k) who actaully worked in the business as well as being company secretary. Downturn in business meant a halt to payment of salaries and dividends and expense advances to the secretary were written off "to be treated as a redundancy payment" - about £4000 so a reasonable figure but not an ideal way of going about it. Pension contributions of about £1500 pa for the company secretary have continued after the redundancy and client feels this is reasonable because of the company secretarial services continuing. It seems an odd arragement but can anyone see any specific problems with this please for the company or the company secretary? Many thanks.