If consolidation is the route you are considering, remortgaging may well be cheaper than a secured second charge, both in fees and interest rate.
If however the DMP is running OK, and you, and your creditors are happy with the payments, there is no feasible reason to turn unsecured debt into secured debt.
If, however creditors are starting to kick off and it looks like they are moving towards court enforced charging orders, it's time to start looking at releasing some of the equity in your property as long as there are no affordability issues with paying a larger mortgage moving forward.
Just as a matter of interest what is the interest rate you have on your current mortgage?
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