As far as I know, the infamous "de-phasing handle" was never used/installed on UK aircraft...I'm sure someone will confirm otherwise if untrue. Instead we left things pretty much as they were set from the last servicing. If space was an issue the blades came off and blade folding was quite rare.
When I was on 431MU (83-84) I helped stitch a rear pylon together after some 40 'minor' cracks were found.
Later, in my 9+ years on Chinooks on 18, at PCSF and PCMF and on 78, there were some large cracks found about the Cockpit frames aft and fwd under the floor. At the time 'we' mused that it was possibly those big spring things under the seats (STVA's?) wobbling away like crazy things all the time creating small areas of fatigue...no-one listened to us, btw.
I hope all is sorted soon.