If you’re with O2 you can download the o2 Priority App to get freebies and enter competitions!
You can get a free hot drink from Greggs at the moment 
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@tilly thanks for sharing! O2 Priority is a brilliant places for deals and freebies.
If anyone is on other providers, there’s usually a version for you. Vodafone’s is “veryme”, for example. Worth checking if your provider has one and downloading the app