I can't say fairer than that

I/You can't say fairer than that.

  (British & Australian informal)
something that you say in order to tell someone that an offer you have made is fair and that you think they should accept it I'll wash the dishes if you cook dinner. You can't say fairer than that, can you?
See also: fairer, say
References in periodicals archive ?
But if she requires any help from a caring person as host of the Pride of BritainAwards, I would be more than pleased to volunteer and I can't say fairer than that.