I recently bought some steam fresh veg bags and they're good for when you're in a hurry, but they're a bit boring and I still prefer our own home-grown veg where possible.
I really wish UK supermarkets had something similar to the frozen mixed veg that you can get in France:
La Parisienne: green beans, potatoes, carrots, button mushrooms, lardons
La Paysanne: broccoli, potatoes, carrots, green beans, button mushrooms, onions
La Méditerranéenne: grilled aubergines & courgettes, potatoes, chopped courgettes, red peppers
La Rustique: potatoes, button mushrooms, green beans, onions, bolete mushrooms
La Champêtre: green beans, carrots, peas, button mushrooms, grelot onions
La Potagère: courgettes, spinach, peas, baby carrots, chopped onions
Some of them come with a herby seasoning sachet you add yourself, some have the herbs already included in the mix (garlic, parsley, chives, thyme, etc.)
They're designed to be sauted in a pan rather than microwaved so they have added sunflower oil and aren't as healthy as the steam fresh bags, but they taste so much better
We always buy one of the ones with potatoes in when we're on holiday to stick in the freezer - they make a great accompaniment to steak or other grilled meat. Very quick and easy and minimal washing up