Mine are all from central bedfordshire - a place called Rowney Warren near chicksands.
Its a great place to walk the dog in wet weather as the sand means most of it drains almost instantly so you dont get very muddy.
It has a series of ridges criss-crossed by paths and the human erosion of the pathways provides fresh blocks.
The layers of sandstone close to the surface have mostly been fractured into small blocks - presumably from the weight of glaciers?
I have attempted to work out how the sequence exposed at this site fits into the overall Woburn Sands formation but had to put that on hold while revising.
Now thats finished I will have a dig around when I get back from my holiday.
Have you ever visited the exposure at the RSPB reserve at Sandy?