The procurement contact named on the official notice.

The submission route named on the official notice.

HM Revenue & Customs HMRC is the UK's tax and customs authority.

It collects the money that pays for the UK's public services and gives financial support to people.

We want to be a trusted, modern tax and customs department - operating an effective, resilient system that gives the public confidence in our ability to deliver.

This means modernising what we do and how we do it.

Technology is at the heart of that change.

By making smarter use of the data, we hold we can, over the coming years, build a system that helps people get their tax right first time, reduces mistakes and makes it harder to bend or break the rules.

Chief Digital and Information Office (CDIO) HMRC's Chief Digital and Information Officer (CDIO) leads the department's IT and security function and is responsible for all the technology powering one of the biggest digitally enabled transformations anywhere in Europe.

In order to facilitate a complete monitoring service of HMRC front-end digital services, HMRC critically require the ability to see what devices, email addresses, telephone numbers and IP addresses our customers are using and to match these against 'known bad' attributes previously involved in fraud or attributes that have been compromised.