Found it. It's moved to Colleague Help, search USDAW Partnership Agreement, Terms and Conditions
Rest Entitlements
In addition to the break allowance, colleagues are entitled to the following periods of rest:
A minimum of one day off per week
A minimum of eleven hours between shifts (excluding split shifts). Tesco and Usdaw have agreed that, for adult workers, on occasion this can be reduced to a minimum of 8 hours between shifts, although where this is the case, compensatory rest must be given during the following four weeks. For dotcom drivers, a minimum of 10 hours rest must be given between shifts.