Shameless plug, but if you need to set up a substitution agreement with another company, i.e. a "swapsies" partner, checkout https://agree.digital https://agree

Shameless plug, but if you need to set up a substitution agreement with another company, i.e. a "swapsies" partner, checkout https://agree.digital https://agree.digital. It's generally a good idea to have documentation in place you can use as proof if HMRC come knocking!