In the garden with sycamores close to the toilet block. I have a photo but could only do a back of camera shot for you if of interest until I get home in a fortnight.
PS: I thought the eastern Stonechat on Unst an obvious Stejneger’s and very similar to the 2016 bird written up in that report by Paul Harvey. If no DNA becomes available I would expect it to be accepted by BBRC in the future when things settle down.