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I swear a wild flower meadow is harder to grow than a bowling green lawn.
For the back, assuming you currently have a squarish lawn with boarders around the edge if, I would sow some wild seed mix along the edge of the boarder and lawn, then leave a foot or two next to the beds uncut, then another foot cut high. Then buy those wild flower matting strips and put a row across the last quarter of the garden two deep and let the grass grow beyond. That way you should get a line of flowers which gives the illusion of them continuing.
My best suggestion if you actually want a want a wild lawn is to totally rip yours up and start again. Preferably hiring someone. People sell wild lawn turf. Definitely do this for the front, trying to do it yourself will just leave you with a derelict looking garden for a year until you give up and mow it.
I’m giving serious consideration to turning my lawn into a wild flower meadow; front and back. I’ve always wanted an amazing lawn with stripes and I’ve never been about to achieve it. So wild flower meadow ticks a lot of boxes.