Just picked this up at Tesco Home Plus at West Quay Retail Park Southampton. There were a couple left on the shelf. Not sure if store specific or not but worth a look as it's a lovely toy.
Not available at this price online, showing at £29.97 http://direct.tesco.com/q/R.205-4609.aspx
'The Postman Pat giant exclusive playset includes the Greendale post office, Postman Pat's van, Postman Pat, Jess the cat, Mrs Goggins, six road tracks, an envelope, parcels and parcel trolley. Turn the playset around to reveal the inside of the Post Office, and recreate your favourite scenes from Postman Pat. Press the button on the top of the vehicle to hear the SDS theme tune and phrases from various characters. Age range 3yrs+.'