Public Health England (PHE) sites
On 1 October 2021, responsibility for the National Disease Registration Service (NDRS) transferred from Public Health England (PHE) to NHS Digital, resulting in NHS Digital inheriting additional employee sites. Where NDRS employees were accommodated in existing NHS Digital sites, relevant data has been updated to reflect this. Estates data is not available as Actual or Estimate from the remaining small number of sites, so we have estimated for the following categories based on FTE:
- generator fuel use
- gas
- building electricity
- fugitive gas leak tests
- water
- recycling
- waste to energy
- waste to landfill
We have estimated each of these categories according to our overall estate consumption by FTE, and then included them in our final consumption figures. The equivalent carbon and cost numbers have also been adjusted according to the consumption estimate, using the relevant carbon conversion factor, or using a £ per FTE rate for cost.
Estates and facilities
Where invoices are charged against the entire facility, and we only occupy a portion, usage and costs have been calculated pro-rata according to the square footage we occupy.
VAT
VAT has been included in our absolute cost numbers, to be consistent with our previous years’ reporting. Any carbon calculations based on usage cost has been performed excluding VAT and any fees.
Utilities
Water
Smedley Hydro’s water usage was estimated for September and October 2021 based on an average of the usage across the other 10 months of the year.
Gas
Trevelyan Square gas for June 2021 was estimated due to no utility bill provided by the utility company. Numbers were estimated based on May’s daily usage and the exit date of 21st June.
Waste cost
We have estimated our waste costs on a pro-rata basis based on square footage we occupy in the facility. For ICT waste, we took the cost per kg value which was used for estimations in last year’s report (£0.62 per kg) and multiplied the over ICT waste weight (18,000kg) by this factor. This was added to the estates and facilities waste cost to get an overall waste cost.
Outsourced data services
This item represents data centre usage for the NHSmail service. Consumption in KWh has been estimated for October 2021 - March 2022 based on April 2021 – September 2021 data. This estimate has then been used to extrapolate a carbon figure.