The UK's benefit payment systems do not record the nationality of claimants as nationality itself is not a condition of entitlement. Therefore, it is not possible to determine the number of non-UK nationals claiming benefit or registered with Jobcentre Plus from administrative data.
I have commissioned work to release information regarding the nationality of benefits claimants at the point of registration for a national insurance number. I hope to make these preliminary statistics available shortly. In addition, I have asked my officials to look in to ways of capturing nationality information at source.