...funnily enough, dazzlenation...I think that you might be looking at Harwich library rather than the national archives....and all because my sixth sense is picking up on something that ling's mob had got up to....go figure:

https://www.google.co.uk/maps/place/Harwich+Library/@51.9364222,1.2812992,3a,75y,28.68h,81.51t/data=!3m6!1e1!3m4!1sTkLoPRAvyhMUl6LTFtS_UQ!2e0!7i13312!8i6656!4m12!1m6!3m5!1s0x47d976c9a02a673d:0x28a0c916c3a97b18!2sHarwich+Library!8m2!3d51.9365685!4d1.2816531!3m4!1s0x47d976c9a02a673d:0x28a0c916c3a97b18!8m2!3d51.9365685!4d1.2816531