We decided to take advantage of the warm, dry spell to take our 7-year-old granddaughter to Hell Gill, a beautiful limestone gorge in Mallerstang ? a veritable ?cave without a roof?. Although not very long (430 m according to Limestone and Caves of the Yorkshire Dales) Hell Gill is a fine gorge, quite spectacular, in fact, with walls rising to 12?15 m and narrowing down to less than a metre.
The going is mainly dead easy (at least in dry weather), with water of varying depth up to about thigh/waist deep, but there is one point where a ~2.5 m cascade drops you into very deep water, with a ~3-m swim.
A ?through trip? takes about 20?30 minutes . . . we enjoyed it so much that we did it twice.

Here's the deep bit:

And a pretty bit:

Great fun!  And no problems positioning the lighting for the photography! (Great photos, by the way.)

Thank you, Roger.

Looks like great fun! Will have to remember this for when my kids are bigger.....

Was up there myself a few weeks ago.  Fab place with lots of historic overtones.  Also liked the look of that massive house they have built right next to it.  Would make a great place to stay 

Got the odd ?1m to spare, Badlad?