I don't know OB, it's a hard one to pin down and every situation is different, but it was one of those occasions where I didn't feel I had handled it correctly.
In BOTH teams there were individuals who were paying attention and realised the restart had been taken
in BOTH teams there were individuals who weren't paying attention and didn't realise
in BOTH teams there were players who were expecting me to blow my whistle, and other players who weren't
Overall, it felt like a bit of a mess, and a try was scored almost unopposed under the posts. So it's a seven-pointer.
Blue were happy with their seven points, but they didn't all necessarily think it was good refereeing.
Nowadays I think I would be more likely to choose one of these options
1 - the kick off was being taken unreasonably fast, peep : take it again
2 - the oppo were being unreasonably slow to get ready : if it's just laziness, time off and warning, if it's cynical then a FK.