Family - Amaurobiidae used to be Agelenidae
Genus - Coelotes
Many thanks to Gary Bradley of Uksafari.com
for forwarding my photo's to Ian Dawson of the
British Arachnological Society.
Many thanks to Ian for sharing his knowledge:-
"This is a Coelotes sp., either C. atropos or C. terrestris, depending on
where it was found. The female remains with her eggsac until she
dies, the young spiderlings feeding on her body."