Avios discounts on Iberia

[JamesBrown]

I have a longstanding IB+ account (many years).

I have a longstanding BAEC account (again, many years).

I can transfer Avios between them (when Combine My Avios is actually working !).

But I’m darned if I can work out how to use Avios to get a discount off an IB revenue fare…

A quick idiot’s guide to doing so would be greatly appreciated 🙂