Small lawns can just end up looking un-cared for and overgrown if left to grow wild flowers. So make sure that you mow an edge around it or a mown path through it so that it shows that it is intended to be that way! Wildflower meadows are quite a lot of work so don't be fooled into thinking that it looks after itself.
Wildflowers need an impoverished soil and you will need to keep the grasses at bay or they will smother the plants that you want to grow. Yellow Rattle is a plant that is parasitic on graases and reduces their vigour. This is usually included in the mix.
Gardenadvice.co.uk has detailed instructions on how to go about this project. Good luck!

Agree with volunteer. We had thought of having a wildflower area but gave up after a year when the flowers disappeared and the grass took over. We have lots of insects and bees though on our buddlea and sedum plants in our more formally planted border and the bees seem to have loved the tulips this year.

Do you know, I don't think I'll bother after all! I noticed recently that a little raised area in a nearby precinct ,which last year was full of lots of wild flowers, is now looking really poor, more weeds than flowers! I'm glad I asked first, because, I was hoping it would mean LESS work!( My hubby has really bad knees and doesn't do much). So thankyou very much you two for that. I'll carry on with me bit of grass!

A shame, but it is probably the best choice unless you have sheep or lots of time to weed!