Well, you never know my dissertation might end up being blather and/or crud too! But I hope not. Anyway cheers guys for all your very helpful suggestions - most of which had not occurred to me (but some had!).
As long as I think its good I'll be happy to share the dissertation with other mudcatters! I wish I'd thought of mentioning this before as it's great to sit back and for all these brilliant ideas to flood in. The dissertation will write itself at this rate! (This might be wishful thinking on my part!)
Right got to get back to it!
Louisa