For this camera on other MF/Classic Cameras forums fellow enthusiasts recommend Ed Trzoska of Leicester (0116 2674247)
A subsequent telephone conversation was enough to convince me of his wide experience of Ikoflex servicing/repair, stock of spare parts etc.
Incedentally closer critical inspection of my lc revealed oil on at least one shutter blade, specks of rust on the lower film roller and much dirt on the viewing screen and/or surface of the fresnel lens below it.