According to British National Annex BS EN 1991-1-3/NA 2003
Article
Commentary
4.1(1)
The characteristic values of the snow load on the ground is calculated using following formula:
Note that there is (A-100) as the original (A+100) gives wrong results. This modification will be part of next BS-EN corrigenda.
4.2(1)
Using the default EN
4.3(1)
5.2(7)
The recommended value of exposure coefficient Ce in the UK is 1,0 for all topographies.
5.2(8)
The recommended value of thermal coefficient Ct in the UK is 1,0 for all roofing materials