Annex I Reference periods as referred to in Article 15(2)
United Kingdom
| Sector | Reference period (years) |
|---|---|
| Railways | 30 |
| Water supply/sanitation | 30 |
| Roads | 25-30 |
| Waste management | 25-30 |
| Ports and airports | 25 |
| Urban transport | 25-30 |
| Energy | 15-25 |
| Research and innovation | 15-25 |
| Broadband | 15-20 |
| Business infrastructure | 10-15 |
| Other sectors | 10-15 |