Thanks for the replies...in relation to your question, AlbacoreA, when we decided to move in 2003, I was wearing boom-tinted glasses (a popular fashion accessory at the time!) and so we considered that over the next five years or so, that we could sell the rental property at a profit; hindsight and all that.
Bronte, you are right about tax eating into the rental income. Last October, I had to add extra money to cover the taxation (hadn't allowed for the USC) BUT I don't think it is as high as 50%. The tax relief on maintenance and repairs helps to offset the full impact. But in general, taxation is only going in one direction and that is one of the reasons we are considering off-loading.
Also, landlord fatigue is setting in... a bit older now and busy enough keeping our own house in order without worrying about another house.
Finally, regarding reasons for wanting to sell, I suppose at the back of our minds is the possibility of some major economic shock occurring in the world, leaving us with a big mortgage late in life and a worthless house.
Having re-checked the balance on our mortgage, it is actually 150k, but in any event between selling costs , CGT, and everything else, I would expect to only just about break-even in the event of selling the rented house. I wouldn't at all expect anything near a 50k or 60k windfall after a sale.
Overall, the reason I posted my query was just to obtain some feed-back about how things stand on this front at the moment. Glad to see that both of you see some merit in holding onto the rental property.