Just tuned in, and the phone number is coloured in orange, (purple on price-drop and red on speed auction) also the phone call price and the p&p price signs are as big a the product price!!
I noticed that aswell also one of the presenters mentioned the p&p when selling curtains and duvet etc. Didn't mention the amount though if you bought curtains duvet and bedspread the p&p would be nearly £24.