Invasion of the Bugs?

Just noted Ian Tew's recording of a Western conifer seed bug (Leptoglossus occidentalis) on the Gower wildlife blog. It may be entirely unconnected but, on the Dorset field trip (20-24th September), I noted dozens of these pest species on houses (presumably attracted by lights) on the walls of houses on the Island of Portland. Portland is a major migration route for insects (as well as birds) so one can't help wonder if there was a mass crossing from the continent around this time.