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Did a quick search of Tesco online found the chow mein but not the beef, though the writeup does mention the beef at the end, so, think the answer must be yes they do still do the beef but Tesco don't have it in stock.

Product Description
Soft noodles with chopped and shaped beef, vegetables, crispy noodles and soy sauce.
If you should meet a creature with the body of a snake, the head of a crocodile and the claws of a lion, that's flapping leathery wings and breathing fire, you've found yourself a dragon. For centuries the Chinese have considered this mythical animal a symbol of power and fertility. Down through the ages they've used the dragon to decorate everything from clothing to cooking pots. Dragons were believed to live on a diet of human sacrifice. But that may be because easy to prepare, tasty meals - such as the exciting eating experience of our Chow Mein - were not readily available in ancient times. There's a point to ponder as you enjoy your Vesta meal.
Treat yourself to Vesta's Indian style Beef Curry.