How can the Workforce Data be accurate when it doesn’t contain Bank and Agency use or supernumerary elements of the workforce such as junior doctors and student nurses/social workers who contribute to delivering activity?

These elements can be added very easily. Whilst bank/agency/temp staff are not normally stored alongside the substantive workforce, WRaPT can incorporate them just so long as they are correctly detailed within the workforce template and have an associated cost centre with aligned activity, just like every other role in the workforce.