Hi Gordon,
Small world....Ray Hammond lives (literally) just down the hill from me; I have'nt seen him for a while (I only know him to say hello to, no more unfortunately). A friend at work used to help exhibit "Buntingham" on the exhibition circuit, built by Ray to S4 (not P4) track standards, just to prove to non-believers that it could be done. Complete with working point rodding and interlocking....