If we lead by 200 runs or more on the first innings and England are all out we have the option of asking them to bat again. If we do that and they score more than 200 runs in their second innings then we can bat again to get the short fall or until we are all out.

If there is less than a 200 run lead then we just have to bat again and so either all get out or if we think we have enough runs to win we can declare.

If we decide not to enforce the follow on then we bat again and increase our lead and decide when we want to declare if we are not all bowled out.

The biggest problem with enforcing the follow on is that your bowlers don't get a rest and so can be tired and jaded.

If your bowlers aren't tired then you would enforce the follow on

If we are running out of time then we will enforce the follow on.

I am sure with three days gone and only two left we will want a 200 run lead and enforce the follow on.