Firstly, just let me put you off doing a codicil, a short form document which changes a will.
They were “invented” when people used to handwrite Wills, to avoid having to be written again. There is no need in the modern world to do that and they cause more trouble than ever they sold.
In my practice we banned them years ago although we would charge the same to redraft the whole will as for the codicil.
So you cannot change the Will, but you can write a new one and you cannot change a Lasting Power of attorney, you have to cancel it under a new one.
If you Google Charity Free Will, many will do a free will for you in the hope that you will leave something to the charity and some as for a nominal contribution. I think the lifeboats were doing it for GBP40.
With regard to the Lasting Power of Attorney is just a case of slogging through the paperwork because it’s not technical, there’s just a lot of writing names and addresses.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have