joint and several liability

My boyfriend is being persued by the Bradford and Bingley for a shortfall debt of £22500 after 13 years. He has been in touch with his ex who has sent him copies of letters she has recieved from the Bradford and Bingley which show that they were only persuing her for £6300 which she says thay agreed in 1991 that that would be her liability on the debt. She payed £10 per month for 12 years which they reviewed every six months but never changed the payments and she payed a full and final of £2600 last year. We have offered a lump sum of £5000 which they are considering but we feel they will reject our offer. My question is are they allowed to agree different liabilities for each debtor on the same debt? I KNOW THEY CAN SETTLE FOR DIFFERENT AMOUNTS AS IT DEPENDS ON PERSONAL CIRCUMSTANCES. But can they give different liabilities? Can we use these letters in court if they turn down our offer?

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