TRAVELLERS can now rent an entire youth hostel for their exclusive use from pounds 100 a night in a new scheme launched by the YHA. The scheme offers hostels in all parts of England and Wales. For example, Cockermouth hostel in the Lake District, which sleeps up to 28 people, costs pounds 100 for the first and second nights, and pounds 80 for subsequent nights. Over the Christmas and New Year period, it costs pounds 110 per night. Further information: Northern England and Central England, 0629 825 850; Wales, 0222 396766; Southern England, 0722 337494.