Funny you mention that (for the tailwheel validity statement) I actually phoned the CAA for the answer to that exact question and after putting me on hold for some time to go and query it, they came back and told me it would be recognised in the UK.
Interesting given that Tailwheel Differences Training is an EASA requirement.
Wondering whether it is because the privileges of an EASA Instrutor is to teach for the issue, revalidation or renewal of
Licences and
Ratings and Differences
Training is none of these?