There was no RA, though, was there? Only a TA, according to the report.
BTW, the TCAS 1, as fitted to the SK76, doesn't have the ability to give RA so there was no requirement for that crew to make a report, although they would no doubt have filed an AIRPROX based on other factors if they had felt the need.
To be perfectly blunt though, having had what I considered at the time very good cause to file a few AIRPROX reports, they don't actually seem to achieve much (apart from giving the board something to discuss over lunch of course).