It gets very messy ad nothing you have posted in particularly east to address- there isnt enough info here to work out how this will pan out - all i would say is do as many projected calcs as you need so that if there is large year end adjust then you are at least aware.
There will be after year end calc addressing everything whetehr via submitted tax return / simple assessment or p800
Also should this latest pension still show on my account as not receiving an income.
Not sure excatly what you mean - you may actively need to inform hmrc income source has ceased if that is the case - hmrc current year income projects can being wildly inaccurate this will affect coding splits so you may need to advise hmrc of projected incoe amounts to make progress