Just returning to trials after a long lay off. When I last rode, the ACU licence was in three types, Club, National and International. I am unable to see the National licence listed now, does the normal club licence now cover national events ?  

Yes

There is now only one type of licence, which is now called a Trials Registration Card. You join a club, they issue you with a Unique Number which registers you to that club, and you then apply on-line to acu.org.uk and the licence department will issue you with the card which enables you to ride in any ACU event.