Are you looking to do this soon ? As said right now you have the daily IB 340 going back to A350 in March. AY 350 will be returning to LHR next year after a stint with the 330. Avios redemptions need to be booked well in advance for this one.
AY also using A330 on HEL-AGP-HEL for a nearly 5 hours of J within Europe.
The LATAM 789 between MAD-FRA is highly recommended ! But with fares being so cheap I would pay money for this one & collect the points.
Not a redemption opportunity but EI uses A330 DUB-AGP Mar - Oct. I tried last year. Full J class cabin for 3 hours.
Another one not OW was the LX 77W LHR-ZRH in J I did last year & is back next Feb for a couple of rosters.
A great way to try long haul product without breaking the bank !