Waitrose, they have some nice vegan desserts by Freaks of Nature. There is also a vegan lime mango and coconut dessert by Pots and Co that comes in a ramekin you can keep.
Good range of vegan yogurts- coconut collaborative, co-yo (salted caranel one is DH favourite). I think they are do those cashew and almond ones, forget the name.
Violife cheeses stocked there usually.
I think they have White Rabbit vegan pizzas.
In the freezer bit they do packets of quinoa and butternut squash, called them steamers I think. They are a couple of minutes in the microwave and are a good basis for a quick meal. They also have packets of frozen chargrilled aubergine that are ok, but definitely need good bit more cooking.
In antipasti bit, look out for jars of Aivar, delicious pepper and aubergine spread that perks up just about anything.
Rude Health Chocolate and Hazelnut milk, or Tigernut Mylk.
Sainsburys stock do gf vegan pumpkin ravioli by UGO- gorgeous. Not Waitrose but worth looking out for.