As far as I am aware, easyJet do not refund delayed flights.
If an aircraft has a slot of 1130, then this is because of ATC slot restrictions...nothing to do with easyJet.
In other easyJet news: easyJet have announced a £78.7m loss for the 6 months to March 2010, £50m better than the same period last year.
BBC News - Easyjet says ash disruption cost up to £75m