TPD ( Tobacco proucts Directive ) = legislation to apply across all EU Countries, as the UK was then, and which is still in force. In short it restricted the size of vape tanks, the size of bottles E liquid could be bought in and limited the max strength of nicotine permitted.
The full size Triton had a very very short run in the UK, though IMHO it was a great tank, because of TPD. The Triton Mini was also an excellent tank but for their own reasons the makers did not keep it in production.
You'll struggle to get coils for a full size Triton now in the UK but might be able to get them either from China ( Fasttech) or the USA but again if you can get them may have to settle for the full size Nautilus coils.
How much E liquid does your tank hold? If 2 mlls it's a Mini and you can use Nautilus coils or get Triton coils from the likes of the companies I mentioned in my first post. If it takes more than that it the old Pre TPD model.