WRW#12B: Broken . . . but Unboughed!
The cache, a camo-taped 35mm film pot, is hidden in this broken but very much still alive mature tree just off the trail at the start of an area of developing (wild cherry?) woodland. The above photo shows the tree before it was 'tidied up'.
The nearest I have got to identifying it is that (from the characteristics of the trunk, twigs and buds - no leaves at the time of hiding . . .) it is one of the numerous forms of willow hybrid - see here for an impressive list of willows found in Britain and Ireland.
Willows, also called sallows and osiers, form the genus Salix - around 400 species of deciduous trees and shrubs - found primarily on moist soils in cold and temperate regions of the Northern Hemisphere. Most species are known as willow, but some narrow-leaved shrub species are called osier, and some broader-leaved species are referred to as sallow (from Old English sealh, related to the Latin word salix, willow).
To reach the cache: park @ or near N 53 55.807 W 1 50.233 in the car park of the sports centre and follow the Dales Way footpath, which continues from the north-west corner of the car park, past the location of GC7EJ80 WRW#12A: Funny Gateand then at N 53 55.836 W 1 50.433, instead of heading left along Dales Way, continue straight on and head towards the riverside path and cache location.
Although not thought to be a hybrid of this particular tree, the basket willow or (common) osier (Salix viminalis) is a species of willow native to Europe, Western Asia, and the Himalayas. More than 60 different kinds of osier hybrids and cultivated varieties are grown in Britain for the basket-making industry.
It is commonly found along the Wharfe as recalled by the well-known TV gardening presenter Alan 
Titchmarsh in an April 2019 newspaper piece about his joy of fishing '. . . My very first forays with rod and line were on the banks of the River Wharfe in Ilkley at the age of eight or 10. A willow wand cut from a streamside osier made my rod; a spare cotton reel from mum's work-basket provided the line, and a bent pin became the hook . . .'
It a multi-stemmed shrub growing to 3-6 m (rarely 10 m) tall. It has long, erect, straight branches with greenish-grey bark. The long and slender leaves are 10–25 cm long but only 0.5–2 cm broad - dark green above, with a silky grey-haired underside.
The flowers are catkins, produced in early spring before the leaves; they are dioecious, with male and female catkins on separate plants. The male catkins are yellow and oval-shaped; the female catkins are longer and more cylindrical; they mature in early summer when the fruit capsules split open to release the numerous minute seeds.
It is commonly found by streams and other wet places. As a cultivated or naturalised plant, it is widespread throughout both Britain and Ireland, but only at lower altitudes. It is one of the least variable willows, but will hybridise with several other species.
Value to wildlife: Caterpillars of a number of moth species feed on the foliage, including the lackey, herald and red-tipped clearwing. The catkins provide an important source of early nectar and pollen for bees and other insects, and the branches make good nesting and roosting sites for birds.
Mythology and symbolism: There is little folklore associated with osier. However, there is a local custom in Chediston, Suffolk, known as a 'willow stripping' ceremony. This is usually held at the first full moon in May. A Green George figure is dressed in willow strippings, dances around and is then ceremoniously thrown into the local pond. See herefor an illustrated blog on 'willow-stripping' and the 'green man' dance.
Uses: Osier withies (strong, flexible stems) along with related willows are traditionally used for basket-making and weaving (hence its other common name basket willow', and are becoming increasingly popular for use as willow screens and sculptures. See here for a fascinating illustrated Victorian article on osier uses and harvesting and here for a short video on willow basket making.
Osier, like all willows, is also grown for its ability to absorb heavy metals, and is often planted to 'clean up' contaminated waste ground.
Another increasing use is in energy forestry, effluent treatment, wastewater gardens, and in cadmium phytoremediation for water purification - being a known hyperaccumulator of cadmium, chromium, lead, mercury, petroleum hydrocarbons, organic solvents, MTBE, TCE and by products, selenium, silver, uranium, and zinc, and potassium ferrocyanide.