If the fishing carries on like this,at least you will be able to go in your garden and catch.I reckon with a bit of persuasion you could get a few of us around to help drink tea,eat toast and have a fish or two.
dave i got my chub from bridgemere garden world last year they cost me 5 each and they seem to be thriving they have grown 2inch since last year i feed them on slugs and the occasional catipiler that i find in my garden if you want some then i suggest you pay them a visit they also had other coarse fish on sale like silver bream and barbel
i have got some small rudd seem ok got them free when picking up weed for pond as my dog like swiming and eating weed in the pond .it gets through lots of weed in the year. yes we do feed it.
my pond only about 1 to 2000 galons have tryed tench carp they just dig the pond up and get too big over 3 lbs in a few years
They used to sell small perch at my local aquarium centre. I don't know if they still do because it changed hands. Also it's in Hertfordshire. I'll find out anyway, but I don't reckon perch travel very well in the mail. 
Chub, it is definitely illegal to take any fish from a water without the owner's permission. It is also a legal requirement to obtain a section 30 from the EA if you wish to move fish from one water to another, even if it's your garden pond. I know this looks a bit extreme, but the legislation was drawn up to reduce the chance of spreading diseases & is very comprehensive.
You could try emailing the EA to see what the exact situation is as regards your own pond.
Try asking at you local aquatics center Chub, they can normally get any kind of fish you want.
As for the sturgeon they sell some lovely ones at the Hollybush garden center just off junction 11 of the M6 around 4 to 5ft long & start at 99 each.
Just cos i ain't postin, it don't mean i ain't watchin