According to Ministry of Justice figures on
A court recommendation;
For non-EEA nationals-a custodial sentence of 12 months or more either in one sentence, or as an aggregate of two or three sentences over a period of five years or a custodial sentence of any length for a drug offence (an offence other than possession only);
For EEA nationals - a custodial sentence of 12 months or more for an offence involving drugs, violent or sexual crimes or a custodial sentence of 24 months or more for other offences.
There was a monthly average in 2009 of 550 time-served foreign national offenders detained in prisons who the UKBA was seeking deportation against.