Low risk backlog
Moderate risk
Significant risk
High risk
£12bn
10
8
6
4
2
0
2011-12
13-14
15-16
17-18
19-20
2021-22
Low risk backlog
Moderate risk
Significant risk
High risk
£12bn
10
8
6
4
2
0
2011-12
12-13
13-14
14-15
15-16
16-17
17-18
18-19
19-20
20-21
2021-22