Put battery terminals on wrong way, won't start
 

i did the most stupid thing after recharging the battery

put it back the wrong way around

now i read this is serious

battery works but nothing happens when turn ignition

clock stopped working also..?

NO, !!!!!!
help please, in £ debt already, i even have a spare engine for it

no fuse inside gone, replace chunky ones outside/relays and pray?

nice move, you've likely burned something out somewhere. hope you have a lot of hours to spend with a multimeter. try swapping the relays around - provided they are the same ones, many are - to see if you can get any change. with any luck its only a relay and this method will let you figure out which one(s)