Thanks for taking the time to contact us about your plans to visit.
We would suggest that you have a look at the Dublin Airport facilities
page on their website where there is some information on the baggage storage options at the airport. Please contact them directly for information on pricing and location.
Most international flights arrive at Terminal 1 at Dublin Airport so this is probably the terminal for you which is where the baggage storage facility is located.
Your ticket to London Heathrow should have the information on the airline you are using for check-in and they will tell you the details. We would suggest contacting them when you initially land for advice on your UK flight.
There have been recent changes to the current travel and public health guidelines. To keep up to date, we'd suggest keeping an eye on our own Traveller's Health Page
for all official resources. You will need to fill in a passenger locator form
before arrival in Dublin, one is not required for the UK as you will have been in the common travel area for 10 days.
Are you flying back to Cape Town from the UK or returning through Dublin?