Wish I'd taken more notice of Mally125's review. Item arrived promptly and in good condition, but as Mally125 discovered, it leaks from the cap quite badly. It would probably be fine in an upright position without any shaking, but I expect more from a water bottle that was (hopefully) manufactured in the 21st century regardless of when it was first designed.
Although it only cost 8 pounds, I think I'll be getting in touch with Gullivers Travels and see if they are aware of any manufacturing defects which could give me a replacement/refund...
UPDATE:
Gullivers travels have provided outstanding customer service since the above. They have since sent me a replacement bottle even though I contacted them outside of their 10 day refund policy. The new bottle works fine, no leaks, so im assuming its hit or miss with the seal on this product....