I have Core+Packages+Class 1,2 & 3 through work.
But would like to get Tanks & Class 4,5,6,8 & 9, this i pay for myself.
Any good companies to try in Surrey or Within the M25?
Cheers in advance.
A lot of Surrey is within the M25.It isn’t a boundary it’s just a motorway that actually runs through the county.Hopefully that will remain the case or there’ll be a lot of,what are presently,Surrey’s residents moving out. 
If its getting near to the 5 years since your last ADR training then perhaps you would be better to go for the whole 5 day course which, if you choose it, can count for at least 21 hours of DCPC 
PS - you have class 1 explosives - thats a rarity is it not?