Sad news folks. Herbie's condition got worse last night, with two really bad fits at 8 and about 1 am. He was still pretty "out of it" throughout the night, just sitting very subdued. He rallied briefly this morning (and I took a few snaps,) before getting him to the vets at 9. Vet said the escalation of fits probably meant it was a brain tumour and would just get worse. Had to make that decision - hard on one hand, but easy on the other because it was so hard to see him suffering.
RIP Herbert J. Gingercat, Esq. One in a million tabbies.