Never fished the River mate, but lets try and get some conversation going on this for you!
Grubber or Ellips pellets would no doubt work, or look at the Teme Severn website, I used their Salmon flavoured pellets to good effect a few seasons back, and they worked immediately, no doubt still do if I were to use them again.
A good tip would be to try and find out what pellets/boilies are predominately being used on that venue, then try something 'just' a little different.
The salmon pellets that I once used worked on a water with devastating results due in part that so many anglers were using the Hinders ellips pellets, so I decided to use something very similar, but made sure the flavour of the bait was something different.