For the outside EASA stuff you really need 1000 plus under your belt before they will convert ratings. And even then some countries are more involved than others.
Also as well there isn't normally any problems finding locals to instruct so you might have problems with work permits.
Get a job in the UK build your hours then have a look at the large schools. If you can try and get CRI multi engine and build your IFR hours up by hook and crook. Getting in the sirrus side of things might help.
Other than that try for schools with CPL instruction you never know if you seem keen enough and anti disappearing off to the airlines they may go for you as a potential CPL/IR instructor and help you get the required quals.
But to be honest these days its virtually impossible to make the jump without going off to work commercially for a period to get the required hours to be able to teach CPL and IR.