The CPL/IR flight school I left paid their ME-IR instructors £40k plus bonuses for additional hours flown over their monthly target.
I had an interview recently for another well known integrated flight school who offered £42500k plus pension, bonuses, BUPA etc.
Remember, flight schools that want to attract instructors at ME-IR level have to provide at least an F/O jet salary or they are not going to recruit or retain the professional staff they require.
Hope this helps. TJ