I look after one for them, and i am no mug! They pay well and on time. Takes me less than 2 minutes and is right next to my other shops. Dont know why you all making such a fuss, unless windows are massive, they arent on mine dont see what your problems are.
Pretty much all the shops i look or have looked after are national, WHSmith, HSBC, Boots, Nationwide, Santander, Your Move etc.