Npv timing of cashflows

T0, T1 etc are points in time that are 1 year apart. T0 is 'now' - today. T1 is the end of the first year / start of the second year. T2 is the end of the second year / start of the third year and so on. We always assume that operating flows (i.e. sales revenue, and costs of material/labour etc) occur at the ends of years (unless told otherwise) and so the first flows are at time 1. The timing of other flows depends on the wording of the question.

Perfect exactly what I am after! Thanks so much

You are very welcome :-)