No, at LHR we have a helipad/FATO that’s 250m from the edge of the nearest runway, and we only apply wake separation if an A380 is using the runway.
I do realise that’s not the question, that you were asking about lighter aircraft on the runway behind a heavier helicopter, but the theory holds.
See ICAO Annex 14 vol 2, table 3-1:
