What is the cheapest way to borrow 10,000GBP?

I own my house, it is paid off. What is the cheapest way to borrow about 10,000GBP? A secured loan is coming in at roughly 7.9% Can I get a mortgage for this amount over a short space of time? What is a home equity loan? I am looking for the lowest interest rate possible and I am flexible with the repayment schedule.