In reply to JohnnyW:
dunno if this is of use, but I was in Kandersteg & the path below the north face of the Eiger last week and there were snow patches down to 2600m - I suspect there will be some snow on the Bochette which they'll need crampons/an axe/a rope for. Switzerland got a huge dollop of rain last week which caused the rivers to burst banks and a fair bit of rockfall so bear that in mind.