Mortgage renewal and unsecured debt.

My current mortgage is coming up for renewal. I have 20 years outstanding and a balance of £310k. My house is valued at £600k. I have £30k of unsecured debt and whilst I make the payments and haven’t defaulted I’m wondering if borrowing some against the house will ease my monthly expenditure which is starting to pinch a little.
I appreciate I’m turning unsecured money to secured money but I feel like it would make my life less miserable.