Am I likely to get fined?

Josquin

Could you ring them?

Once through, I have found them helpful and it would put your mind at rest.

Jeremy535897

You haven't been asked to file a self assessment return, from what you say. You don't owe any tax for 2019/20 so you don't need to file a self assessment return for 2019/20, unless you want to register as self employed. Read my earlier post:

You do not need to worry about any fines, because presumably you have not been asked to complete a self assessment return, and you don't owe any tax.
If this is likely to be an ongoing income stream above £1,000 a year, technically you should register as self employed. For 2019/20, I would regard the amount you earned as "other income", which you can do for small one off sources, but if it is going on, register as self employed from 6 April 2020, which you must do by 5 October 2021. See:
https://www.gov.uk/register-for-self-assessment/self-employed

You don't need to tell HMRC anything via your government gateway account.

fuzexi

Okay thank you. I was just worried that's all. I've got a whole lot of other things to do so I'll just put it to one side.