Vera's sister-in-law Joyce says she wants a washing machine which costs "twenty five pounds". Until decimalization in 1971, most luxury goods (such as washing machines and men's suits) were priced in guineas not pounds. Interestingly, in the film the cost of the abortion is expressed as two guineas.
(One guinea = one pound one shilling, equivalent to one pound five pence in decimal.)
This was true for some outlets, particularly those wishing to appeal to the middle class or those aspiring to a degree of 'poshness'. Throughout the 1960s most domestic items were priced in £.s.d or Pounds, shillings and pence. Services and professions continued to charge in guineas as an affectation until much later.