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SCENARIO BRIEFING

Exercise Grey Heron

Vallen, UK · Issued 10 Oct 2026 · Fictional scenario for training only

You are the Local Resilience Forum of a fictional UK region named Vallen, in the autumn of 2028. In Exercise Grey Heron you will experience a civil contingency challenge concurrent with the last phase of the US presidential election, the transition, and the immediate aftermath of the new president’s inauguration.

In this sandbox, you can explore Vallen, read the Turn One Briefing, and input a Course of Action for your chosen role: Mayor, Police, Fire, Ambulance & Coastguard, Regional Energy Chief Operating Officer, Regional Military HQ, or a civil servant expert in Stratcoms delegated to the MSA from Whitehall.

You can also explore the current status of Vallen’s infrastructure, and the state of public opinion in the region, segmented by age, occupation, ethnicity/religion and political tribe.

STATUS AT START OF TURN 1
Threat level (JTAC)Moderate
Russian postureHybrid
Game length4 months
CCA 2004Hardened
Defence Readiness ActIn force

1 · Global situation

2 · National situation

3 · Vallen at the start of the exercise

4 · Powers available

LEGISLATION STATUS
Civil Contingencies Act 2004Hardened; places statutory duties on LRFs
National Security Act 2023In force against foreign interference; little appetite to prosecute UK nationals
Defence Readiness ActIn force

The Defence Readiness Act lets the state centrally direct critical infrastructure through a single ministry; mobilise the reserve and strategic reserve; restrict online disinformation sources; and direct defence, dual-use industrial and university research facilities.

5 · Preparations already in place

In the 12 months before the exercise opens, each Blue cell made one preparatory decision.

CELL PREPARATION
CNIEach household has 5 days' food and water stockpiled
Emergency services200 staff trained in drone surveillance
StratcomsCrisis booklet and town-hall meetings
MSACommunity Emergency Hubs in 80% of settlements
MilitarySecure database of 9,000 Strategic Reservists

6 · How the game runs

TURN TIMING
1Ends 7 Nov 2028
2Ends 7 Jan 2029
3Ends 30 Jan 2029
4Lasts 180 days

Each turn, every cell submits a course of action. The umpires adjudicate and report the effects at the next turn briefing. Decisive, joined-up action at regional level will always have a tangible effect.

This document describes the state of the world, the UK and the Vallen region at STARTEX. Vallen’s MSA, emergency services and military HQ are geographically coterminous, representing an idealised state versus the patchwork reality of the UK.

In a real Feliks.ai wargame, your LRF would face hybrid actions targeted at the UK in general, and the region specifically. The Red Team would act dynamically to achieve goals for an adversary that are unknown to you.

The sandbox presents only the game environment. The full product is dynamic and interactive, and can be tailored to suit your training and exercise needs. Please contact the Feliks.ai team to arrange a trial.

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