hi mate.

have you taken the plugs out after cranking over to see if soaked.

if not take plugs out and dry only 1 and 3 [then unplug the injectors] then crank over engine [only 2/3 times]
to get excess fuel out .

put plugs in. crank engine over and get mate to connect the injector that will stop it flooding until no.1 fires up

it some times works.

or if all else fails a dam good bump start.

my golf done the same thing one day not start done what i said and work ever since sold it two weeks later tho