Principle designer/principle contractor

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Hi- our extension is about to begin but we've got a stumbling block about who is the principal designer. The architect says he has no more to do with the build, but equal the builder isn't keen to have the role. What do people do? Any help much appreciated.

What package did you sign up to with your architect? We have design and build so they provide the project manager too?
You can project manage yourself, but make sure you understand about site safety etc.
Or there are professional project managers who you can employ. So builders have them on their team, but not all. Though my parents employed a project manager and he then found all the other trades.

Under CDM Regulations, if you have more than 2 subcontractors on site you must engage a Principal Contractor, this will be your builder. The PD role is normally undertaken by the Architect because he will still be engaged if you decide on any changes during the build. This link may help?

Construction - Construction (Design and Management) Regulations 20015 - What do I need to do? - Domestic clients: roles and responsibilities (hse.gov.uk)