Being a landlord can be a load of hassle. Ask yourself if you want to deal with tenants who won't pay rent etc and the letting agent will only be of limited use if this happens. I was a landlord for about 8 years and didn't like it at all (didn't like the hassle, didn't like the time it took up and I didn't like having to make business decisions about someone else’s home).
Without getting into speculation about property prices I think you need to think long and hard about investing in property at the moment. You would be putting a large chunk of your resources into one asset class when you have just started a pension. You will also have high entry and exit costs and your rental income will be taxed.
I think you should take CCOVICH's advice and talk to an independent advisor.