It looks like Romanians can be deported back to Romania. They are also generally excluded from entering the UK by official channels
Around 14,800 EU citizens were refused entry to the UK in the year ending 30 September 2023 at UK ports of entry or at checkpoints in Belgium, France, or the Netherlands (known as juxtaposed controls). Almost half of EU nationals refused entry were Romanian (48%, around 7,000).
A long read if some one wants to know what has been going on in this general area - so many wont bother
It includes
Enforced returns have fallen more than voluntary ones. From 2007 onwards, total voluntary returns – comprising both facilitated or monitored and independent returns – outnumbered enforced returns. The Home Office prefers voluntary returns, in part because they are much cheaper. An estimate from 2013 put the average cost of a voluntary return at around £1,000, compared to £15,000 for an enforced return.
Around 14,800 EU citizens were refused entry to the UK in the year ending 30 September 2023 at UK ports of entry or at checkpoints in Belgium, France, or the Netherlands (known as juxtaposed controls). Almost half of EU nationals refused entry were Romanian (48%, around 7,000).
A long read if some one wants to know what has been going on in this general area - so many wont bother
Deportation, removal, and voluntary departure from the UK - Migration Observatory
This briefing examines the deportation and voluntary departure of irregular migrants and other foreign citizens from the UK.
migrationobservatory.ox.ac.uk
Enforced returns have fallen more than voluntary ones. From 2007 onwards, total voluntary returns – comprising both facilitated or monitored and independent returns – outnumbered enforced returns. The Home Office prefers voluntary returns, in part because they are much cheaper. An estimate from 2013 put the average cost of a voluntary return at around £1,000, compared to £15,000 for an enforced return.