My wife had her first Pfizer injection about 10 days ago. She felt 'tired' two days later but that could of been a coincidence, no real problems.
Both of my parents had their first Oxford injections some time ago. Father - no side effects. Mother had a headache & fatigue the next day, that's all.
I've heard from several others locally, the headache / tiredness / fatigue, type comments are fairly common. I'm happy to report that in ALL the cases that I know about these effects have all gone within 3 days, or less. As Pat said above, in the unlikely event of any serious issues seek advice asap.
There should be over 15 million vaccinations done in the UK by Monday 15th (the majority first dose only so far, but a bloody good effort)
Looking forward to mine !