So either it's a batch problem or the Malaysian factory doesn't have all the components and is churning them out regardless. There's a freepost Uk address for returns, so I'm sending mine back. If you decide to do the same, just be aware that the options on the provided returns form tries to get you to accept vouchers, a replacement or an alternative choice but not a refund:
CDWOW: "I have attached our Returns Form which provides the necessary instructions on how to complete a return with CDWOW! I have also made a 'Return Authorised' note within our system to make sure that our Returns Department are able to process your replacement as quickly as possible.
Please ensure that you return the item within 60 days; after this time the
Return Authority will expire. We encourage you retain proof of the return."
ME: "Hello and thank you for your prompt reply. I would like a refund (as stated as an option in your terms and conditions) but this is not catered for on the returns form. Please tell me how to opt for a refund. Thank you."
CDWOW: "I would request you to enclose a note along with the returns form that you want a full refund for the item.
As soon as the item is received back in our office we will immediately process the refund back to the original form of payment."
I'm also going to print out a copy of that email convo and include it with the disc.
Hope this helps someone.