Another quick query… (sorry!)
Looking at the Core book (p191) you can create a Quality 1 asset with a point of determination that lasts the whole session, and spend 2 momentum to make it Quality 2.
On p152, If you create an asset with momentum alone in a scene, you can make it permanent by spending a total of 4 momentum (2pt to create, 2pts to make permanent).
The question: Can you spend an extra 2 momentum to make a determination derived asset permanent?
Never apologise for asking questions, ask away! 
Thats a good point, I see no reason for a determination asset not to be made permanent in the same way as with momentum. If the Quality works out rather high (anything 2 or above) the GM might make it more expensive though, as while Determination is a valuable resource, assets of high quality are much scarcer.
Thank you - the potential for abuse was the one thing that worried me, but I guess there’s no reason why as a GM I can’t either just have them last at higher quality for longer, or target the assets.
Yup. The GMs word (and the rule of fun) overrules anything and everything we put in the rulebook if need be.
(just in case you need an official statement!)