That works out at...
£6,750 per employee.
The UK's Department for Work and Pensions (DWP) is leading a £958.7 million ($1.2 billion) search for a supplier to develop business processes for new ERP and HR systems to bring together four central government departments. This month, the DWP launched the procurement of the Synergy Business Process Services (BPS), which will …
If you believe https://www.erpfocus.com/erp-implementation-costs.html it's over the odds (as expected for anything involving gov procurement), but only by about 20%. If the figures in the article include license/SaaS subs then it'll be less.
Although will no doubt run over.
Someone in this sort of business said unless you know what they want, it is hard to cost it. She was involved in merging two differently looking systems from two departments, and both departments assumed their GUI would be the one in the new system.
When she asked about "the right to be forgotten" and how long to keep data for, people gave her a blank look. She said her company spent a lot of time with them helping them understand what they wanted, and then once they had a better idea of what they wanted, they went with a "cheaper solution" and the costs overran.