Upvote:6
Have I been banned into UK. Or ...
I think you have been "Removed from" the UK. If you paid for your own return flight it might be regarded as leaving voluntarily even though the immigration officer issued a removal notice. If the airline was forced to return you to your home country at their own cost I guess this means you were removed. You might need to explain more or consult a UK lawyer to be certain (but see below).
This removal notice will affect future visa requests by you. See:
If you were banned, I believe you would have received a paper document saying so.
See
wat can I do to knw my stand
You may be able to make a Subject Access Request
See