We're currently in France on hols in our van - and thank god for free internet access!

Whilst driving, I've noticed the clutch getting 'soft' and then I struggle to get into gear (any gear). After driving only in 4th, we pulled over, rattled the gear stick, pressed the clutch a few times and the problem seemed to clear. The van seems fine now, but does anyone have any idea what the problem may have been in case we get a recurrence as we still have to get home!!

Van is a 1984 1.9 with 4 speed gearbox.
Thanks!!
Phil