*UPDATE*
Thank you all for listening to me rant.
My son and girlfriend made it to London for his birthday weekend, I used National express coach service. They were helpful and it was far, far cheaper than trying to get a train a week before travel and didn't take much longer than the train would have done.
I still feel that Trainline had an obligation to to at least be a little bit helpful ( as I was told from their customer services" I am in India and your tickets are in UK, What can I do?"). But, reading other comments it would seem that train line is not the only company who cannot see their obligation to provide a better service for delivery or re-issue of any purchased tickets.
Having also since looked on Royal Mail for delivery prices, the price for untracked 2nd class is only 76p but only covers good to value of £20! Trainline charge £1.95). For anything with a value over £50 and under £250 it
has to be signed for. So, WHY are they using an untracked/unsigned 2nd class method for delivery? especially as the value of the tickets would far exceed the £20 you could claim from RM. The only other method was next day signed for, but i wasn't in a hurry so didn't need that option and I didn't know the 2nd class option was untracked( it doesn't say)!!
As you may have read on my previous post I was going to Paypal resolution. I have finally just heard back from them. I AM GETTING A REFUND



(little jig around the living room) Although it will probably now go towards my phone bill to their customer services charged at 13p per minute.
Anyway, I am so pleased with this result. I have tried so hard to not to shout and scream about it, and I know to some it wasn't that much money ( read Trainline) but I had to save for those tickets to give my Son a great 18th birthday. having to buy more travel tickets was not in my budget. I hope this also helps someone else get a better result with train companies.