Any reward seat alert sites other than Seatspy?

I was a bit annoyed this week to discover that my membership of Seatspy had expired and I'd had no email notification to renew whilst waiting on an alert for a seat which I might now have missed.

Does anyone know if this is the only Virgin alert site or are there alternatives? Thanks

ExpertFlyer is another

Virgin has their own site which I find very useful.

https://travelplus.virginatlantic.com/r ... ght-finder