This question is a follow up to someone's question: Getting refused entry and removed at Heathrow, X in passport
If a traveler with a one way ticket to the UK from his/her home country is refused entry at port and returned to the origin country, is the person considered to have left the UK at the expense (directly or indirectly) of the Secretary of State, in which case he/she faces a 5 year ban ?
In the situation they have onward booked travel to a different country (where they also have citizenship and hence right to entry) from origin, will UK immigration remove them to that destination or strictly back to the original departure point?
I am looking for some policy manual source, precedent, or expert knowledge of such matters.