After 1916, generally only Granted patents were published.
A new series of 7 digit patent numbers were published from 4 January 1979 to the present, beginning with the number GB2000001. Click on this link to go to the catalogue record to find the exact years and volumes available online.
Under the Patents & Designs Act 1907 (Section 91 (4), these patent applications were printed and given numbers under the six-figure series.
The printing of these foreign patents ceased during World War II.
Classification Search in Espacenet by using either the International Patent Classification (IPC) system or the Cooperative Patent Classification (CPC) system (replaced the European Classification (ECLA) system on 1st January 2013).
The WIPO (World Intellectual Property Organization) enables full text searching of over 1.6 million international patent applications from 1978, including selected British patents, via its Search Service Many British patents were also registered in the US, so it may also be worth searching both the Google Patents and USPTO (United State Patent and Trademark Office) sites.