Caporegime
As a like for like, you should compare your capital repayment and your interest payment. At a guess though, your interest is around £400/month so your comparison would be renting costs you £925/month whereas the mortgage costs for £400/month as you're in effect renting from the bank instead.
My house has gone up in value about 20% in the past 5 years so if I did the maths I would be looking at around £2k/month rent vs ~£300/month interest along with £100k+ in appreciation.
£120k dead money in renting vs £18,000 interest and £100k appreciation. Difference of around £200k over 5 years. Its massive.