Hi Sonya!
In my opinion (and I have loads of those ;-)) I don't see the point in making repayments as long as your debt is being serviced... How much of a dent is £60 a month really going to make into your mortgage? It may bring your mortgage down by 7K over the next 10 years but the real way to pay off your debt is o take that spare cash and leverage it against other property (or other investments) to make a larger profit - or save it for when your tenant sips out without paying the rent for 3 months...
You can easily work out the impact the money would have with a mortgage calculator:
http://www.guardian.co.uk/money/mortgage-calculator Let me know what you decide I'll be interested to hear other opinions.
Take car
Tim