Hi Colin,
Your celtic knot pens are awesome, it's something couldn't do but I have just looked at the gordian knot and that looks impossible to my dyslexic brain. Post the pics of your celtic knots matey. I have to be honest and say I've not heard of Hairy oak and Silky oak.
I do like Oak pens though and have made mainly English or European and Bog oak is lovely to turn especially Irish bog oak. I turned a Irish bog oak for a work colleagues PTSD charity. Oak is a beautiful wood and I'd love to see the Oak lacewood I bet the figuring is awesome.
Lance