Sorry my reply didnt get posted. I tried this yesterday and it worked fine. After 3.5hrs of use my 8000mah powerbank had 50% power remaining.
It worked on my TP link Archer router, however not sure how safe it is for the router since its power rating is 9v 0.6a.
So Whiskey Brothers do have stock... I called in this morning. Its not the original crystal Glencairn glass though... Its a glass alternative. The crystal original would be first prize if it could be found locally.