OK so let's start with the basics
At the back of the player you will find the region code of both DVD and bluray it should be 5 and C. After you check that verify if there is a region code stamped on the discs purchased from crosswords. Try it in another player or a pc DVD player perhaps..
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Thank you very much for guiding me through the basics, Rajiv. I unplugged the wires and had a good look at the back of the BDP-S1500. I could see the number "5" and the letter "C" marked under the words "DVD" and "BD" respectively, printed on a picture of the globe with latitudes and longitudes marked on it. So the player is correct for the Region India is located in.
On having a fresh look at the DVDs I could see the number "2" on a simillar picture of the globe, followed by the letters "PAL". Evidently the DVDs are suitable for the UK but not for India.
I tried to play the DVDs on my Dell laptop with a Windows 8.1 platform but without success.
On doing a google search for a way out, I came up with three possible solutions.
1. Buy a Region-free DVD player.
2. Buy a Region 2 DVD player.
3. Play the DVDs on a PC or laptop with a Linux platform.
A fourth option would be to sell the DVDs to someone who owns a Region-free or Region 2 DVD player. Crosswords are unlikely to give me a refund after such a long gap.
What do you suggest would be the best way out?