I have to agree with Dare, you do need a spinner, and for the reasons he said. Edwards has a test average pushing 40, Roach's decent average is completely reliant on his figures against bangladesh (against australia it was 51, against SA it's now over 100), Taylors' is 35 which is sub par.
I mean these are not even good bowlers (roach has potential, taylor has yet to deliver on his and time is running out, edwards is flat out over-rated), let alone brilliant ones that can tear threw teams. You could never, ever, ever, ever go into to a match without a spinner with a pace line up like that.