I've been out of the country so how do I know if my Finlandia TV set can receive digital TV?

You'll need a digibox and a digital aeriel.. Also you'll need to live in an area that recieves digital signals - check your post code here http://www.dtg.org.uk/retailer/coverage.html

the tv will play any signal it receives - so it can play a freeview digital picture if you have a digi-box (£30) good signal and a ' wideband' aerial to receive digital signals they can be about £15 to £30 depending how many elements your local tv shop says you need - or you can buy then from someone like cpc in preston - go online - you may need a digital signal booster box along the aerial cable next to the tv about £20 it plugs into the mains and sends power to a little booster box you need to fit up at the aerial end

Are you sure its only 4 years old ?.Don't worry a set top box will work and be easy to use if the set has a scart socket on the back.The previous points made about signal availability and aerial reqiurements should also be noted.