Since January 2020 all Surveys in the Bulletin have been published open access.
The London Mathematical Society acknowledges support from a legacy by Frank Gerrish in the publication of expository articles and surveys where institutional funds are not available.
The Bulletin has published survey articles since its launch in 1969. A collection of recent Survey articles (2010 - present) is available online here: https://londmathsoc.onlinelibrary.wiley.com/doi/toc/10.1112/(ISSN)1469-2120.survey-articles
The Managing Editors of the Bulletin welcome submissions of authoritative Survey articles via the Bulletin EditFlow site selecting "survey" as your article type.