Advice needed!

The agency called me tonight, they need someone for a special “one off” job later this year, and would I be interested. Seems that the regular driver has had a bit of heart trouble, and won’t be back in time to do it. Well, I asked a few questions about the job, sounds cracking, but I’m still not sure if I should take it, as there are one or two downsides to it.
First of all, I’m told I will be given full training.Its for one day only starting somewhere up north, multi drop and with set times for each delivery. Most of the drops are unaccompanied, I have to let myself in and unload the goods to a specific place. I will be told how to access each premises, and exactly where to leave the goods.
They told me that at many drops there will be some food left out so I won’t go hungry, and maybe the odd drink too, although as I’m driving, I’m not sure whether I should take it or not. I get to wear a special uniform, and as it can be cold in December, I get a fur lined boots and hat, and no need for a stupid hi Viz jacket.
As it is a charitable organisation, I’m told that I’m exempt from tachograph and driver’s hour’s regulations, which is just as well, as it’s at least a 24 hour shift. Can anyone confirm this for me?
The truck I’m driving is a specially made one, it’s called something like a Raindear Unslay, has anyone ever driven one of these before? Anyone know what the maximum gross weight is? I think I’m going out fully loaded. Is it auto or manual box? Is it Digital or Analogue tachograph? Apparently it’s only about 8 HP although I’m told it goes like a rocket. Going to have to watch the speed though, don’t want any more points. It has no headlights, just a huge red light on the front, is this legal?
Finally, has anyone ever worked for St Clause Transport before? What are they like to work for? Are they hot on Elf & safety? What’s the pay and working conditions like? Do I need a CRB to deliver to domestic houses?