I'm clear what I'm trying to say - it's just that we're splitting hairs somewhat counterproductively, Bob. I'm talking about what is involved in an order, whereas you're focusing on the possible outcomes of an order for the end user.
The point I was trying to make, which I understand Andrew is also making, is that the only way from MPF (full LLU) to any scenario other than ceasing one or both of the existing services involves some sort of provide order. If the end user wants to keep voice and broadband service with no gap in service, this must either be a provision order for MPF with a new LLU provider, or a simultaneous provision order of some sort.
If someone on MPF wishes to take voice service from another provider and keep broadband from the current LLU provider, it is up to the LLU provider whether they are happy to go along with this or whether they require the customer to leave completely. As you say, Bob, this is a commercial decision of the LLU provider whether to allow this.
If the LLU provider is content to keep providing broadband, this needs a simultaneous provide of SMPF and WLR3, which will involve the jumpers from the MPF directly to the LLU MSAN being removed.
If the existing LLU provider refuses to keep providing broadband, another sort of order will need to be made, which could be MPF with another LLU provider, or it could be WLR3. A WLR3 order could be accompanied by a simultaneous or subsequent order for a broadband product (such as a BT Wholesale broadband product, SMPF or FTTC). A subsequent order involves a break in broadband service.
If someone on MPF wishes to take broadband service from another provider, it is a commercial decision of the current LLU provider whether to continue providing voice service. If they are content to keep providing voice service, this typically requires provision of WLR3 for the voice service plus some service to deliver the new broadband service (which could be SMPF, a BT Wholesale ADSL or ADSL2+ product, or FTTC).
There are a few exceptions where the voice service from the current LLU provider could continue on MPF.
If the new broadband provider offers broadband service using a wholesale product with the LLU provider, it would be possible for voice service to continue on MPF rather than a WLR3 and SMPF combination being used.
If the new broadband service uses FTTP, MPF voice can continue as the voice and broadband are entirely separate.
If the new broadband service uses FTTC, there is no technical bar to the existing jumpers on the MDF to the LLU provider's MSAN remaining to provide voice service, though my understanding is that Openreach will only allow FTTC to be ordered on an MPF line by the CP who rents the MPF as the MPF product involves renting the entire allowable spectrum, including that used for FTTC, to the MPF CP.
In any scenario where MPF voice could continue, the current LLU provider might choose to switch to providing voice service via WLR3 to prevent awkward situations in the future where the end user does not have the full range of broadband options they were expecting.
Of course, this level of detail is unlikely to matter to the end user. All the end user is likely to care about is whether the losing full LLU provider will continue to provide a service they don't want to move, or whether they require the end user to leave completely.