Ok. For money laundering you need to show evidence (bank statement) that the deposit is in your account. If it is for more than six months then great but if for less than 6 you need a full paper trail.
So, for example, your parents give you a loan of say £25k in time for settlement, then the solicitor should be getting their ID and their 6 month paper trail as well.
If less than 6 months you need evidence of exactly where this money came from.
The bank statement must be registered to the same address as your ID.
If the money came from a previous sale of property then providing the state for settlement for that sale should suffice.
If an inheritance then the solicitor dealing with the deceased's estate should help.
If just your own savings, the as above, a bank statement should be fine.
DoeS that help? Can you say wheee the deposit is coming from?