How does one know it is Bacterial tonsillitis?
Might it be Glandular fever?
Just a couple of thoughts.
\\\My question is, is this ‘normal’ to have an elevated temperature for a long time with Tonsillitis and at what point should I consider calling the doctors surgery again?\\\
It sounds like viral tonsillitis in which case he is reacting, normally and predictably.
I think that you are over-reacting at the moment and unless his general condition deteriorates, has difficulty in swallowing or becomes delirious, I wouldn't call the doctor again.