I'm having a try at this. I'm in Warwickshire.
My efforts are extemely amateur. So don't follow what I'm doing. This is just for your entertainment, and showing you how not to do it.
Anyway, in an area of rough grass, I tried removing some strips of turf, which I sowed with 4 varieties of wildflower seeds (some from T&M, some from Johnsons):
I sowed about 10 days ago. Because it's been very dry during the past few days, I've been using a watering can. Some seeds have already germinated:
The ground looks rough. I didn't do much preparation. If these plants are to hold their own against grass, then they'll need to grow up tough.
I've also tried planting some plugs, like this:
I had a disaster with some red clover plugs. The day after I'd planted, some animal ate most of the top growth on the little plants. So these are now covered with cloches for protection: