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Did both of you intend this to be a legally binding agreement?
Okay. Pressure and stress are not usually good defences to saying an agreement shouldn't be binding. Equally, neither is that the accountant advising you was not impartial.
If you could show that the person signing the agreement with you mislead you in some way, that might make it invalid, but you're starting from a position of not great strength I expect.
Could be - if there is a misrepresentation of fact in there which induced you to sign the agreement.
Anybody can draw up a contract for others to sign, yes.
I would recommend you take the agreement to a solicitor and see if you can find a way of challenging the bits that cause you concern.
You might be able to make some argument undue influence, thinking about it, but I expect it will be hard to do.
Have a look at this: http://www.e-lawresources.co.uk/Undue-Influence.php
UI usually arises in different circumstances, such as where a husband persuades the wife to sign a charge over their house. If this is shown, then it can make the agreement unenforceable.