Ready for walking some of the Pilgrims' way to Canterbury I've designed a Pilgrim's passport for me and Dad - there's no where official to get a stamp but there are Youth Hostels in Dorking (Tanners Hatch off Ranmore Road in Surrey, 1km off the route) and Canterbury (54 Dover Road) as well as several in London. In addition most post offices have their own stamps (they are rather plain but they were always willing to stamp the passports me and Dad made and used on the Coast to Coast walk) and you may find other places as well with a stamp or who will be willing to write the name of their shop/pub/hotel/restaurant etc and date your passport. The pictures below show how I put the passport together (this is a rough version that I made to see how well it worked hence the pencil lines on it). The box of the second from the right page is ready for the Cathedral stamp in Canterbury - as the starting point for the Pilgrimage for Rome they are used to stamping passports ...
A blog about the Pilgrimage to Santiago de Compostela