Shortage of eye drops

Is anyone having trouble obtaining Glaucoma eye drops. My usual ones Fixapost are out of stock, and have been for a couple of weeks. The alternatives are also out of stock. I use preservative free ones as other alternatives irritate my eyes. I usually order through Pharmacy2U. I cannot find an NHS emergency stock notice which they normally issue if there is a problem like there was back in Feb this year. Every time I reorder now I worry they wont have them in stock. local pharmacies dont have them either. I have some left but I will have to contact my eye consultant if they dont come into stock soon.