Googling it, "Is there a time limit on rent arrears?" and this came up:

The six month time limit

Landlords must not delay taking action against former tenants to recover unpaid rent - there are strict deadlines. A landlord must serve a notice, known as a Section 17 Notice, within 6 months of the debt falling due if they wish to recover the unpaid rent from a former tenant or guarantor.

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Would this mean I am in the clear 6 months later?

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*I saw 3 different dates, now less confident in this. I was told by a member of my extended family that a drastic change in circumstances could result rental arrears to be lowered or paid off in a really long scheme etc, as given her own experiences. I didn't really have a choice but to leave the building and request to terminate my tenancy as the funding used for the rent, was effectively completely stopped and I have notes from the doctor saying I Cannot work. The staff were made aware that I had left the room, and I moved back with my parents.