If Leach isn't effective, then Root and Lawrence could share spinning duties, just to hold an end whilst the faster bowlers do the business at the other end.
You're only picking 2 seamers, then? Robinson will bat 8, with Wood/Broad, Leach and Jimmy. Stokes cannot be relied upon to bowl. Leach is absolutely guaranteed to play unless he gets injured or the pitch is the greenest seamer we've ever seen.