Thanks for the advise. I phoned the bike shop, where I got it, back and they basically said, although not straight out, that they thought it was the manufacturer covering themselves. The bag is very sturdy so it should be ok. The price of the trailer was the thing which made me cautious.
I looked for ages for a trailer and this one ticked all the boxes for safety, durability, space and suspension. It is only available in Europe which is where I am- Scotland. Just wanted peoples opinions, thanks again!