Appendix S1 British and Irish island geography data, butterfly species numbers and species list.

Appendix S2 Species ecological indices and method to obtain (Monte Carlo) random allocations of species pools at island sources (1000 randomly created islands).

Appendix S3 Additional figures. Figure S1: Observed versus predicted scores occupancy of island (log O) based on regression of island occupancy against ecological factors (Colonfac, Migrfac); Figure S2: Observed versus predicted number of species based on regression of species richness (log S) against geographical variables (log I, log Lat, log A).

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