Their press release does talk about SMRs:

The Civil Nuclear Roadmap will give industry certainty of the future direction of the UK’s ambitious nuclear programme, on top of the government’s historic commitment to Sizewell C and world-leading competition to develop small modular reactor (SMR) technology.

[…]

Following its launch last year, Great British Nuclear (GBN) will drive the UK’s nuclear ambitions forward, including through the game-changing SMR competition which will soon invite short-listed companies to tender.

Unlike conventional nuclear reactors that are built on site, SMRs are smaller, can be made in factories, and could transform how power stations are built by making construction faster and less expensive. Alongside large gigawatt power stations, SMRs will play a key role in delivering on the expansion of UK nuclear capacity.