Just thought - I did once go to a works do and a duo was playing called "The Peas" who did covers of popular songs on :
double bass/vocals and acoustic guitar/vocals (bass drum).
Added instrumentation in the form of Kazoo's, mouth trumpets, melodica, beat box.
They were good fun, and sounded good.
They are based in south of England by the looks, so not sure if they would travel.
Music starts after about a minute.
www.trevorgeorge.co.uk/act/the-peas/