If YOU avoid acknowledging the debt and do not make any part payment for a full six year period, then YOU ONLY are in the clear. If your ex does the same, then he too will be in the clear - the Statute of Limitation applies to you separately.(posted 7492 days ago)The six years would have been 12 as it is a deed under seal for a mortgage contract - however, LLoyds TSB are in the CML who have voluntarily stated that if you are not contacted within 6 years of the default (usually the second/third missed payment) then they will not pursue you.
So if we take March 1999 - you will be free of this matter in April 2005 unless they find you and you acknowledge the debt or make part payment before then which would start the six year period off again.
I think this answers your questions.