 After relocating to the UK in late 1983, Leon continued producing pop and alternative recordings, and also wrote and recorded "Klub Anima" for the Kosh Dance Theatre piece.In 1998, Leon produced the comeback "No Exit" by Blondie.Since 1998, Leon had been exclusively producing, orchestrating and recording classical projects including work with Luciano Pavarotti, Andreas Scholl and the Orpheus Chamber Orchestra, Elysium, the Vienna Radio Symphony Orchestra, the London Symphony Orchestra, Joshua Bell and the Academy of St Martin in the Fields, and Sir James Galway.