Is it the norm to surcharge for PayPal?

TrainLine SurchargeI’ve just discovered that The Train Line are charging consumers extra for paying with PayPal, they’re slapping on an extra £1.70, the same charge that they make if you pay by credit card.

Companies are allowed to levy a “small charge” to cover the cost of processing a card payment. The question is does the legislation cover PayPal? One thing’s pretty certain and that is that the PayPal fees will be significantly higher than any credit card charges and the £1.70 charged in this instance certainly won’t cover the costs.

I’ve not seen other companies surcharging if you decide to pay with PayPal. Have you? Are PayPal surcharges the norm, or is The Train Line a one off exception?