Hello Chriscpm, thanks for reaching out on our help forum - a warm welcome to our community.
We're sorry to hear of the missing cap from your return package, we do not have the option to send a terminator cap separately however you can order a new return pack online here and use the parts you're missing from it or we could place an order for this instead.
In any case, this will be sent to your address with Royal Mail so it will take between 3-5 working days to arrive.
Please, do let us know in case you wish us to assist with the process and we're eager to do so.
