Im a sole trader and take 20% out of my labour price and set aside in a separate account for my HMRC payment each year (im not VAT registered) How can I record this?

I'll help you record it, Psellick8.

We'll receive the payment the normal way and deposit it to Undeposited Funds. Then, add a line item for the tax contribution. 

Here's how to add the item:

1. Click the Plus sign (+) icon, then choose Bank Deposit.
2. Choose the payment.
3. Under Add funds to this deposit, add the customer, then choose an account for the for the tax.
4. Enter it as a negative amount.
5. Click the Account drop-down arrow, then choose the bank account.
6. Click Save and close.

I'll include a screenshot for better guidance.

Lastly, you can match it to the bank transaction. 

As always, you can confer to your accountant on the best way to record it.

Drop by anytime if you have other concerns. We'll be right here for you.