A lot of people seem to worry more about Harvard referencing than they do about what they're actually writing. The truth is that hardly anyone takes much notice of references as long as:
(a) they're clearly genuine ; and
(b) they can be checked on in the unlikely event of anyone actually wanting to do so.
The following should suffice:
NHS England (2017). [i]Statistical press notice: Monthly delayed transfers of care data, November 2016[i] . [pdf] . Leeds: Government Statistical Service. Available at:
https://www.england.nhs.uk/statistics/wp-content/uploads/sites/2/2016/06/November-16-DTOC-SPN.pdf [Accessed 17 Jan 2017]