www.lovecrafts.com/en-gb/p/easter-egg-chocolate-orange-cover-knitting-pattern-by-needles-pins
This one is 10 cm but if you wanted it bigger, how about keeping to the pattern, but using a double strand of yarn, or chunky, on rather bigger needles? I did that before Christmas when making stockings for Gdcs - it was a nice simple pattern but just too small.
To think that London, or anywhere else for that matter, does not belong to any one demographic