I ended up taking an old temperamental EOS 400d and kit lenses that I was prepared to sacrifice but had no issue bringing them in. Security looked in the camera bag but didn’t pass any comment. There were a few others around me with DSLRs or Mirrorless system ones aswell.
I’m leaning towards leaving the DSLR at home as well, seems too much of a lottery as to whether it will be allowed in.
Martin, did you ever get an answer on taking a SLR camera?