In reply to gazfellows:
I think we stayed at the "Camping Eigernorwand" campsite, set up the tent so that it opened looking out at the north face. Was a brilliant spot from memory. It has showers and a lounge area, can't remember if we booked in advance or rocked up.
Only downside is its at the bottom of a small hill beneath the town, which is fine normally but after we did the Mittellgi Integrale and then celebratory night on the beers, the next morning it felt like Everest trying to walk up it. The low point was getting overtaken by an octogenarian with a zimmer frame.