I'd try and message them to confirm as I've found the security staff unsure on their rules, depending on who searches you. I've taken in a bag before but my friend got refused with her bag and a other was told no equipment of any kind 🤷‍♀️
Thanks both, just to update I received a response this morning via email I've been added to an exceptions list and told to make myself known to certain members of staff on arrival so definitely worth asking in advance :)
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In my experience you are allowed to take in small bags (up to A4 size). They will check inside at the door but you should be ok to take it inside!