SAML 1
Warning: please note that SAML 1 is deprecated and should no longer be used.
To the best of our knowledge, all SPs in the UK federation support SAML 2 now; so your IdP should not need to support SAML 1. It requires significant additional configuration which may be avoided in most cases.
If you feel you need to support SAML 1 in your IdP deployment then please contact the UK federation support team for discussion and further guidance.