Black downpipe. Regency line.
Had about 10 of these in local store and also many other pieces
Guttering 4M £3.06
Joiners etc.. available
could not find on Wickes site so I assume end of line however looks like this type from Hunter Plastics. The shape means it prob will not fit with other types.http://www.hunterplastics.co.uk/catalogue/25/regency.html#cat125