Royal mail special delivery

[Lunapuf5]

I paid to have a letter collected by special delivery by Royal mail and have asked for them to bring the label. My question is will they also bring the special delivery envelope? If not can I put it in a normal envelope?

I've packaged things myself and sent SD before, so can't see why it wouldn't be able to go in a normal envelope. I'm not aware if they'll bring one, does it not say on the instructions?

Thank you. No, it doesn't say that they will bring the envelope in the instructions even though I think they should, especially as it's a collection. If not I'll have a normal envelope ready in case they don't if that works.