English: Abbots Langley Library & Hertfordshire pudding stone The Library is located on the High Street. The rock mounted on the brick plinth in front of the Library is an example of Hertfordshire pudding stone, a conglomerate of existing smaller flints and pebbles held together by a natural silica and sand cement, glacial in origin, scarce, and unique to the county. From the outside it resembles concrete but inside it looks akin to a fruit or Christmas pudding, from which it takes its name. It was procured for the parishioners of Abbots Langley by Frank Cooper, the local village gardener, who rescued it in 1986 when the land nearby was being excavated to build the Abbots Langley section of the M25 Motorway.