Mea culpa!
Oops. I should have read a bit more closely. The laundry wording has been changed; you can now officially aggregate the actual receipted cost of a wash over several days. Aplogies to all. Alternatively, do only up to £5 worth of washing each day, for which you won't need a receipt. What a great system this is! Must be careful not to choke on my pre-prepared sandwich.
Regards
Ginseng