The complete guide
Buying spares before you're up a ladder — FloPlast 112mm Half Round Gutter External Stop End, Black, Pack of 2
It's far cheaper to order two or three spare external stop ends and a handful of clips than to make a second trip up a ladder for one missing part. Guttering jobs are almost always more efficient done once with slightly more stock on hand than needed — keep the FloPlast 112mm Half Round Gutter External Stop End, Black, Pack of 2 as a standing spare if you maintain more than one property.