I've no idea if you'll be interested in this but just had a look on evil bay and a used Panasonic GX80 could be just about in budget. These sometimes come with a standard range zoom lens and sometimes as a body only. I'd go for a body only and then pick up a lens. One popular lens is the 12-32mm but personally I wouldn't touch that lens as it doesn't have a focus ring, I'd go for a used 14-42mm G Vario, this one...
Order your Panasonic G Vario 14-42mm F3.5-5.6 II Aspherical Black for £188.31 at Photospecialist.co.uk. If ordered before 4:00 PM it will be sent the same day. 2 years of warranty.
www.photospecialist.co.uk
I have one of those and it really is a good lens, IMO.
Or you could buy a cheap adapter (from around £15 or so) and use an old film era manual lens.
For example, adapter...
Find many great new & used options and get the best deals for MD-M4/3 Adapter Ring For Minolta MD Lens to M4/3 M43 Micro Four Thirds UK Stock at the best online prices at eBay! Free delivery for many products.
www.ebay.co.uk
Lenses such as a 28mm f2.8, 35mm f2.8 or 50mm f1.8 are usually available for £15-50.
Whatever you go for, good luck and enjoy!