We used a new template for our budget scrutiny last year. Our service based sub-committees tend only to consider finance info once a year (as we have a finance sub-committee that mops up most issues) so we use the annual budget process to give a full update on the financial position not just consider growth and savings proposals. This takes place in December. The template was constructed knowing that all of the information should be readily available to departments.
The first half required the relevant department(s) to set out their current financial position (their in-year spending/expenditure information); their performance against the growth/savings proposals they had agreed in the previous year's budget and progress against the agreed capital budget.
The second half requires the departments to set out the draft growth/savings and capital proposals they will be putting forward to cabinet..
The principle we used was that scrutiny members needed to have a firm understanding of a department's current financial position and its performance against previous growth/savings targets in order to be able to properly appraise any new growth/savings proposals.
We might be about to change our approach again what with a new cohort of councillors and all expenditure over £500 being published but happy to provide you with our template - firstname.lastname@example.org