Some very detailed posts here - most interesting reading. I expect providing several successive SRAs to inbound aircraft was a real feat of concentration for the controller and probably quite tiring. Not much good for them if they're supposed to be on a statutory break! I hope that didn't happen.
I often used to hear the Approach Controller offer the SRA for controller training purposes and, in my listening experience, it was rare for a pilot to refuse. Useful for aircrew as well in order to stay current - the ILS or NDB/VOR approach may not always be available.