Just to update people going down this route, I’ve had a very helpful response from the Accura support team after I contacted them about my ordered decoder, as suggested by McC.
Although they are in stock for “next day despatch”, as McC posted, unsurprisingly the despatch team is somewhat busy after an intense period of different stock arriving, so there is a delay on such orders. For example I ordered the decoder on June 7th and it’s still in the queue for postage.
No complaints from me, I totally understand and appreciated the explanation. Hopefully this post will avoid other people having to chase their own decoders with the support team.