"Once you still have an existing tracker loan live at the time of application (in my case approval in principle), the tracker offer is valid for the period of the AIP approval. After that, as long as we are still offering the tracker product - and assuming affordability etc doesn't change - we will issue another AIP, or upgrade to full offer if you find a property, and tracker offer will still apply."
Their approvals in principle are 12 months long. That is only in relation to the 6 months period, not type of property. I think they had the 6 months restriction last year.