Principal photography began in the Canton of Bern, Switzerland, on 21 October 1968, with the first scene shot being an aerial view of Bond climbing the stairs of Blofeld's mountain retreat. The scenes were shot atop the now-famous revolving restaurant Piz Gloria, located atop the Schilthorn near the village of Mürren. The location was found by production manager Hubert Fröhlich after three weeks of location scouting in France and Switzerland. The Swiss filming ended up running 56 days over schedule. In March 1969 production moved to England, with London's Pinewood Studios being used for interior shooting, and M's house being shot in Marlow, Buckinghamshire. In April the filmmakers went to Portugal, where principal photography wrapped in May. Filming finished on 23 June, two months later than planned, which was largely due to the warm Swiss winter, which had hampered shooting.