Anyone ever had this problem?
Occasionally (not very often but probably at least twice a day) when going round a bend the red oil light flashes up for a couple of seconds then goes out.

Any ideas?

It sounds like you are low on oil. Top up to the max mark on the dipstck.

Yeah, you just need to top up the oil. Used to happen to me with my old MK2 Punto when braking sharply.

If you need to know which type of oil you need, see here: https://www.fiatforum.com/grande-punto-faqs/231119-grande-punto-oil.html

Lol as above. Unless you've already checked it and it's fine?

Yeah I've checked the oil and the level is fine.

when was the oil and filter last changed?

Would have been at the last service, a year ago now

It's due again then.