On Tue, 05 Jul 2011 08:59:39 +0100, Terry Pinnell wrote:

There's a wasps' nest in my garden - a hole (maybe two, close together)
on a sloping section of rough lawn.

Are they causing a nuisance? If not leave 'em alone they will be
doing you garden good by being predators.

If you must destroy them contact with paraffin, without ignition,
will kill them. Most ant powders will as well (read the label),
liberally dust the entrance holes in the late evening when activity
has died down.

--
Cheers
Dave.