Unit 31 help please

Can anyone help with task 8 in unit 31 sample simulation part 2 .You are asked to note customer account codes and relevant main ledger codes-are you meant to set up your own codes or have I missed a list of these somewhere?
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Task 8
3 cheques received from customers
Write your customer’s account number and the bank nominal a/c number on each of the above cheques.
A remittance advice received from customer advising how much has been paid into our bank a/c.
Write your customer’s account number and the bank nominal a/c number on each of the above remittance.
1 cheque paid to supplier
Write your supplier’s account number and the bank nominal a/c number on each of the above cheques.
1 Petty cash Claim
Write expense nominal account number and the bank nominal a/c number on each of the above petty cash vouchers.