UK Savers - Twixmas Money-Saving Tips

TWIXMAS SAVERS: Hi all - has anyone got any good money saving tips for the time between Xmas and New Year? Or has anyone used that time to do something that has saved them money - clearing out clothes and selling on Vinted, checking subscriptions. I'm open to ideas. This is for a national paper's Money section. Please let me know if you can help: [email redacted]