Hello and thanks for using Just Answer.
I am Al and am happy to assist you with your enquiry.
On the basis of their assurance to your partner that they would cover the rent there is really only one way forward-Your partner would have to sue the Agents at the small claims court for a sum of the outstanding rent amount. He can issue here without the requirement of a Solicitor, to keep costs to a minimumwww.moneyclaim.gov.uk
Before doing so, he should probably send them a letter before action though first. Write to them giving them 14 days to pay and make clear that if they do not then you will sue. Hopefully, the letter will be enough to make them see sense and pay the outstanding rent. If they do not then issue at the small claims court.Hope this helps and sets out the legal position.
Can I assist you any further?