McDonald's has restocked the new Grand Big Mac following a "national shortage" of the huge burger.
But, some fans appeared to remain unable to get their hands on the new 741 calorie treat.
McDonald's launched the Grand Big Mac to celebrate 50 years of the Big Mac.
Fast food lovers rushed to their nearest outlet after its release on February 7 but ravenous Brits were left dismayed when restaurants across the country ran out of the huge sandwich.
McDonalds announced on Friday evening that it was working on rectifying the issue and on Saturday morning said that the big burgers were back in stock.
Some happy customers took to Twitter to post about getting their hands on the calorific burger.
One person wrote: “Sorry guys, no shortage on mine. I had “grand grand Big Mac” as double stacked the 2 f******.”
But others were still reporting shortages.
Abbey Lawson wrote: “@McDonalds wanted a Grand big Mac whilst available and ended up with a regular one but charged for a Grand!!”
Another person said she was left "fuming" when she was informed by her local restaurant that it did not have any burgers left.
The highly sought-after burger was launched as a limited edition alongside the Big Mac Jnr, which contains 400 calories.
A spokesman for the company said: “Due to the overwhelming popularity of our new Grand Big Mac some of our restaurants experienced higher than expected demand resulting in the burgers being sold out for a short period of time.
“Customers should be able to get their hands on the Grand Big Mac at restaurants across the country from this morning if not before.”