I am afraid that we are unable to draft documents for you as that would be tantamount to acting for you and we can only answer questions.
You need to read these guidance notes http://www.landregistry.gov.uk/professional/guides/practice-guide-19
the most common restriction which covers most eventualities (or can cover most eventualities is Form N.
It is listed in the practice guide.
With regard to section
12 you write down there that it is in respect of your beneficial interest in the property resultant on you providing a substantial part of the finance to buy the property from the sale of your previously jointly owned home. Basically, you just put down their, in normal language, why you have an interest in the property.
For the sake of the 100/£150 as a solicitor would charge, I would not DIY.
Can I help further?
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The thread remains open. Thanks