Sensible yes, but making it clear we're proactive and not boring or Establishment (that's us isn't it?)... so how about, instead of a mission statement, a sort of slogan after the title, like
Heritage Alliance - Fighting Against Apathy

To me the 'strapline' needs to be more directly related to the central subject nigel. Not saying it should be this, but summat along the lines of

'Heritage Alliance - Caring About the Past'

(Not sure about the name yet meself but haven't got any suggestions as yet.)

love

Moth

You used the word PROACTIVE !!!!!

How can anything NOT be "actively active"?

If it's active then it's active .....

I HATE THAT STUPID WORD !!!!!!