I don't seem to be able to find any information on Stephen Sheriden's radio comedy Fallen Arches in your list of radio comedy shows. It ran for two series in 1988.
Fallen Arches
Thanks for alerting us to the existence of this series, Mr Neutron. We'd not heard of it before! I've now added the title to our database and will endeavour to research the show in due course.
Here are some links which may help you research the programme.
http://epguides.com/FallenArches/ (Accessed 17/12/2013) http://www.suttonelms.org.uk/ssheridan.html (Accessed 17/12/2013)
Mr Neutron