Looking for Pillbox and other defence locations? Download the Google Earth overlay from the link below and load it up in Google earth.

Google Earth Overlay of the Extended Defence of Britain Database V18.3 October 2020 courtesy of Steve Thompson

Lite versions of the database which can be used on phones.

Some extras for use with the database, including AT Lines and fields of fire

Also new online version – works on Phones available at

Thanks to Matt Aldred for developing and hosting this version.

Example of overlay showing only pillboxes

See this page for instructions on how to use the EDOB overlay

Found something that’s not listed in the database? Please go to the Forum and post details in the Defence Of Britain Project Database section.

Download an Index of Loopholes Issues 1-83

An English Heritage Guide to Recording Military Structures (pdf)

Military Site Recording

Click here to download a copy of Stanton at War 1939 – 45

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We welcome new members to the PSG. We currently have over 300 members in six countries. Members receive the journal Loopholes three times a year which details recent finds and sites of particular interest.
Clicking the Subscribe button will take you to PayPal. Subscriptions will auto- renew until cancelled.
UK Membership - £11.00 - PayPal

Overseas Membership - £16.00 - PayPal

For more details about PSG, membership, Pillboxes or Defence Structure related topics contact our Co-ordinator Roger Thomas


Defence Structures and sites of all types both above and below ground can be very dangerous. Serious injury or even death can arise from unauthorised entry into such sites and structures. Join a responsible club, group or society who can arrange official visits. The Pillbox Study Group accepts no responsibility for any damages or injuries caused by ignoring this advice. The PSG does not encourage members to undertake the ad hoc clearance of vegetation from pillboxes, as it can expose them to physical damage and inappropriate use, it may also contravene a variety of statutory regulations including, listed buildings and SSSI designations. Vegetation clearance should only ever be undertaken as part of a formal arrangement, having sought and obtained permission from the land owner and other necessary authorities. Damaging a listed or scheduled monument can be considered as a Heritage Crime.

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