Isle of Wight - there is a small ephemeral stream sink just east of Newport, around St George's Down - not sure where it flows to, probably Shide, and some very small (cm scale) conduits exposed in some of the Chalk quarries. Downend Quarry in particular has some spectacular sediment filled dissolutionally enlarged pipes and 'caves' exposed in the face. Boreholes in the Chalk between Calstone and Brighstone indicate sediment filled cavities at depth, and there is a large buried sinkhole infilled with Palaeogene sediment exposed on a forestry track on Brighstone Down. There are some sediment filled dissolution pipes in the top chalk surface at Alum Bay but these may be Palaeogene in age, ie palaeokarst. Some voids can be seen in the cliffs between Freshwater Bay and the Needles, but only visible from offshore.
Flamborough Head. Lots of sea caves. I suspect there are lots of small scale conduits in the Chalk of the Yorkshire Wolds, as there is evidence of very high transmissivities and rapid flow from tracer tests, but few caves. The chalk is much harder, but is very well fractured (fracture and bedding spacing on the cm scale rather than metres as in the Carb Lst) and the area is cut by numerous faults (not shown on the map). Some quarries around Langtoft have dissolutionally open fractures, but no enterable caves. Around Flamborough itself the cover of glacial till does generate some possible stream sinks and sinkholes - important hydrogeologically, but I doubt of there will be significant 'open' cave, possibly a shaft or two. There are few other sinking streams in the Wolds, the exception being the Gypsey Race around Wold Newton, which sinks into its bed at various places. It is possible that there may be some larger voids developed on more persistant flint bands in the Burnham Chalk, but finding these will be tricky! There is/was evidence of large freshwater springs in the Humber estuary (around Hessle Whelps). There is a large 'gull' fissure north of Thixendale which may be a collapsed windypit.
