Another possibility is to lift a slab, break up the underlay with a crow bar
or similar so that if you tip water there it will drain away fast, mix a bit
of soil/compost into the rubble then using a large container with the base
removed, stand it where the slab was and finish around it with gravel or
cement or cobbles. the Creeper will grow in the good compost in the
container but will be able to send roots down into the sub strata to find
water. Feed into the top.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk