Hi Chris and welcome to the forum.
Your location is perfect, there are many Cherub sailors in the Bristol area, particularly at Chew/Thornbury - I am not one of them I am afraid but I am sure they will be along here soon to say Hi - if only you'd have popped up last week we were all at Thornbury last weekend !
It would be great to have you in the fleet, we're very proud of our history and would love to hear more from your father too, we were at Royal Victoria last year to share our 60th Anniversary and met many of the people I am sure he would have raced against !
I am not personally familiar with Catananche, but again I am sure someone who is will be along soon, I am sure that she'd make a great starter boat - make sure you know about our different rule sets (pre 97, 97 and 2005) and have a chat to a few of us and we'll make sure you are heading in the right direction.
And any other questions, please feel free to ask or call, you'll find my number in the Contacts section.
Graham