I would however expect a copy of the work pack to be provided if I requested it - I'm obliged to do this under Part 145 for aircraft we maintain.
Indeed; and they refused, giving two different bizzare excuses (I posted only one of them). I reported this to the CAA (to the exactly right people too) who were, shall we say, totally but somewhat "actively" uninterested.
For various specific reasons the magneto overhauled was then effectively worthless so I spent another $800 on an overhaul by Quality Aircraft Accessories in the USA - the usual place chosen by the most careful US owners, for accessories. Fortunately I keep a spare on the shelf (it's a single shaft dual mag) so it didn't ground me.
I now understand Ronaldson are under new ownership

A bit like taking over British Leyland... I do wish you only the best, genuinely...
This is the kind of stuff which one finds all too often in the UK, sadly.
When I did "due diligence" on engine overhaulers here, in 2008, only Nicholson McL were universally spoken of well. One other was good but with a hugely variable lead time, and the others were at best 50/50 which is about par for the UK GA maintenance scene generally.
I sent the engine to Barrett Precision in the USA, who do universally superb work, but sadly for G-reg owners they cannot generate an EASA-1 form. They used to be able to do an Export CofA (though they forgot for my engine even though I requested it

) which used to be OK for a G-reg but AIUI no longer is.
OTOH I gather there is a most interesting paperwork path from an 8130-3 to an EASA-1, via an EASA Part F company.......
Ownership is a fun game...