Contract & Job Description

Hi all,

I'm hoping that someone here can advise me on a small issue with my
job. My company have recently given us new job descriptions to sign,
and these differ quite a lot from our existing ones.

I've been told that I pretty much just have to sign the new job
description, but my manager has agreed that we can write an addendum
to this - apparently it will not be possible to change what has been
issued. If I don't sign, the company can terminate me and reengage
under the new terms. Is this correct?

My main concern though is that they are adding some very subjective
requirements like 'have a positive attitude' and 'must be mature'.
I'm worried about signing a description that includes difficult to
measure conditions like this. I'm concerned that I will be penalised
for being human, especially in an organisation that has had numerous
rounds of redundancies over the past years and is often going
through merger / downsizing programmes.

My contract of employment references my job description, so by
signing this, I take it that I am signing a binding contract? Is
this something that I should pay a lawyer to review or am I just
wasting my time because I have to sign it or leave?

Also, at the moment the job description is not numbered in any way -
it's just headings and paragraphs. Is this acceptable as part of a
legal document, or should I ask for this to be numbered? The reason
I'm asking this is that at the moment it is difficult to accurately
challenge items without quoting the entire paragraph.

Finally, there is a clause in here to the effect that 'from time
to time I will perform other duties as required of me'. Reading that
as a plain-jane, that could mean anything from sweeping the floor to
standing on a street corner to 'increase shareholder value'. Is this
something I should challenge, or again, should I just accept this
and spend my time updating my CV before I have to include
intersections on my reference list :) ?

Thanks loads in advance,

.