Killiaan
A few pointers on the initial question:
* you could reduce the mortgage amounts by getting a mortgage from a UK lender. You will get a lower rate but have to jump through more hoops and you have to be relatively higher income etc to satisfy their criteria for lending to non-UK residents.
* I would be surprised if you actually got £600 rent for a one bed costing £120k in Liverpool. 6% gross yields exist very rarely in the UK market today.
* I was in Liverpool last week and after a recent drop in values, there is a buzz back in the market which could drive capital values upwards again, albeit modestly.
* I have seen properties bought in 2003 at £260 per sq ft sold again in 2005 @ £200 per sq ft in fire sales, so beware of the cost per sq ft you are being asked to pay.
* There is better value in the UK today in lower priced property in seocndayr towns and cities, where you would buy 2 beds for £120k and not see a propertional drop in rental income, so the yields would be higher.
Good luck
Propman