Shouldn't have to take off the excess - as the accident wasn't your fault (iirc) the other insurer will be paying and no excess applies.
either that or you will need to chase the lorry owner for it.
i hope they dont want any money off me at this very moment, the only thing in my pocket is lint! if they do they can ****** wait. cant see why though. i have done nothing wrong so i dont see why i should fork out a bean. tomorrow should be d-day for there new valuation. evry day extra ive got that brand new beamer to drive around in (vigorously) its costing them a pretty penny.