The Greater London Orienteering Summer Series will run from 27th June through to 25th July with an event every Sunday:
|Sunday||27 June||Boston Manor Park||Boston Manor, Piccadilly line||SLOW|
|Sunday||4 July||Wanstead Park||Wanstead + 101 bus||CHIG|
|Sunday||11 July||Reigate Priory||Reigate station||MV|
|Sunday||18 July||Scratchwood||Edgware + 384 bus||LOK|
|Sunday||25 July||Beckenham Place Park||Beckenham Hill||DFOK|
Updated GLOSS guidelines. The principal update is that, exceptionally for 2021 on account of the suspension of orienteering during the Covid-19 pandemic, the period over which British Orienteering ranking points for handicapping purposes are averaged will be the 27-month period from March 2019. This is in line with how the BO ranking list is currently prepared.