PPL & Night Rating it doesn’t matter U.K. or EASA as all you need is an ICAO license with night privileges.
Enrol at Bristol GS for ATPL theory - sit both U.K. and Austro control exams.
Flying - check out Stapleford Flight Centre who’ll sort you out with U.K. & EASA CPL & IRs at a solid price.
APS MCC - several to choose from but VA did well for me.