A finger crack under a bridge outside Broughton Astley. The bridge used to carry the Midland Counties' Railway over the footpath running from Shuttleworth Lane to Cottage Lane. User The Sheep posted about the crack on the UKClimbing.com forums. The crack has been dry-tooled but hasn't yet been bouldered to its apex.
Parking: Park in the layby on Cottage Lane, Cosby, Leicester, LE9 1RS.
Approach: Walk north along the footpath to reach the bridge.
Crack, v. n. to boast ; brag.
"Your very tradesmen, if they be excellent, will crak and brag, and show their folly in excess." 
To the query , 'How are you today?' a very common answer is, 'Nothing to crack of,' or, 'Not to be cracked of.'

ab. a boast.
"Some men make their cracks that they, maugre all men's heads, have found purgatory ."
"Great cracks hath been made that all should be well."
"Out of this fountain proceed all those cracks and brags."
'Ah heerd 'im a -mekkin' his cracks ovver it.'

sb. a twinkling ; a 'jiffy.' 'In a crack,' instantaneously.
- Leicestershire Words, Phrases, and Proverbs, A. B. Evans and S. Evans (1881)