Wildflower Meadow Creation

I am planning to create a wildflower-meadow-like area on the patch of grass at the front of our house - it’s size is approx 3mx2m. Having read various articles and advice I am still unsure whether I can begin this process in September, or need to wait until March. Any recommendations would be appreciated. ( I have already ordered seeds through wildseed.co.uk as recommended by Monty.). Thank you!
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Are you keeping the grass and mixing the seeds with it?
In the sticks near Peterborough
its a patch of grass between our fence line and the unmade road beyond.