Yes you are right it is good practice to use new bolts, I took the old ones out and rang my local L R official distributed, "oh yes I know the ones part number ******* 33 pence each plus VAT, but we don't stock them".
Great, so I cleaned the old ones and tapped the holes then put loctite in the threads before assembling.
I plan to get new ones and take them out one by one to replace them, I am also going to slap some wax oil around the heads just in case I ever need them out again.