historic exchange rate data / graph
I guess this shows my research skills aren't up to scratch, but..
I seem to be unable to get historic exchange rate data for GBPCHF going back to 1950 (or 1900 ideally).
Everything I can find via the web is neophilic and goes back 5 or 10 years at most.
Any pointers to resources, on the web or otherwise, much appreciated.