Should he be in the GP's.
In a word, no. None of the Brits do at this moment.
HOWEVER,
He is easily the best Brit for the job IMO. Highest averaging rider in EL and other leagues, + he has age on his side.
Watching him week in week out I can easily say he is much better than people on here seem to be suggesting. In the Elite League he is bettered by only a handful of riders.
Abroad, his performances this season certainly suggest that he can beat the best regularly.
His Polish Ekstraliga average of 7.06 is fairly good, and his form since he returned from injury would certainly suggest he can do much better than that.
In Sweden, he is 4th in the Averages (although after only 3 meetings) and has proved in that division what he is capable of.
So in short, does he deserve to be in the GP's? NO
Would it be a shocking decision and a calamity if he was chosen? NO
Would he be completely outclassed in the GP's? NO