First there was the `wee fee', then the charge for the privilege of checking-in, now it seems budget airline Ryanair has finally tipped the scales by announcing it is considering a fat tax.

But, just when you thought they couldn't possibly take this any further, there's more.

The company needs customers' help to figure out how to charge the fat tax and its offering the following options:

Charge per kg over 130kg/20 stone (male) and 100kg/15 stone (females).

Charge per inch for every waist inch over 45 inch (male) and 40 inch (female).

Charge for every point in excess of 40 points on the Body Mass Index (+30 points is obese).

Charge for a second seat if passengers' waist touches both armrests simultaneously.

Stephen McNamara, spokesman for Ryanair, explained the four options being offered appeared to be the "simplest".