I decided to chop the trunk on the little Oak - I'd taken off the top but and it began to grow again on the buds near the apex. Hopefully this chop doesn't upset the plant too much.
The cut took away a lot of wood and leaves. I'm hoping it will put some effort into some of the lower branches and less focus on the apex bud. The cut is however placed nicely now for my new apex shoot to be trained.
Bear in mind that the oak throws single opposing leaf nodes unlike the parallel nodes of the maple family.
A lesson learned with the oak is that when its young ( and maybe older as well ) the apex growth is very vigorous so its prudent to pinch the top bud early in the season and retrain the apex shoot when convenient.
The chunk with my hand to show size - about 20cm.
The base of the trunk has shown some very good growth though - its close to doubled in diameter.