Coming back a few months later with updates.
I want to make it clear, even though there are some that would suggest otherwise, I do actually have reciepts for the poor way Milspec handled basic consumer regulation. They were so agregious that at one point I even had to raise a GDPR complaint with the Information Commissioner's Office. It got to the point where I had to have meetings with my bank to resolve the issue... luckily they (milspec) decided to act before it got that far and with all due credit, they did refund the partial ammount.
Some people made it clear that the fault with the valve probably came from GHK, this is most likely true. However others thought that just because it was a gas gun product I was not some how covered by the same protections as a dishwasher for example. I wish to imlpore everyone here to educate themselves on their consumer rights - regardless of whether it's a valve or a new mobile phone. Milspec tried to imply that I went out of my way to cause harm to their business rather than simply handle the issue at hand with professionalism and the courtesy it deserved. If I could chose to support a British company over another I would, but they make that seem like a challenge rather than the pleasure it is supposed to be.
After having my dealings with them, I reached out to others with their own experience, I was shocked by what I heard and how I have seen that some other members of the airsoft community were treated by store owners. Someone told me the story of how they recieved blatant abuse from the owner over Facebook Messanger when they had the audacity to use the sites links to chat function in the middle of the night. Quite hilarously it seems someone here has had a very similar experience and if push comes to shove the fact of the matter is that everything I did was right by the eyes of the law.
Again, I wish this could be some kind of wake-up call for the team over at Milspec, but my heart tells me that these kinds of business owners aren't the types to change and eventually that will be the end of that.
Edit - some spelling errors