Any question answered...

I'm sure Paligap or somewhere else used to offer an upgrade for a wired SL+ Powertap hub to wireless for £80 for hub only. I was always put off because of the price of the wireless computers (no interest in ANT+) so just wanted the Joule or whatever.

I've managed to nab a cheap wireless computer, but now I come to look, I can't see to find anywhere offering the upgrade. Am I too late/shit out of luck?

Wired to Wireless upgrade costs ~£450.

The £80 you are thinking of is the ANT+ updater which is a single-use device that updates their older wireless hubs to ANT+ so they can be used with ANT+ HR and cadence sensors.