I booked to OTP for December back in July. Even then it was showing £129.

I did wonder whether they would change the price. At £64/£79/£89 (I've seen previous upgrades at all of those) per leg. It's a very decent price to get 160TPs while going somewhere I needed to go (on return if you get both, which I usually did).

Not sure whether it will improve on the later released tickets (if there's any left). If it does, I'll post here. On Saturday, the 14 day release may happen.

Incidentally, another trip to OTP in September (booked in June) I was able to upgrade the outbound for £64 successfully. So, definitely a recent change.