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Marconi Instruments also made a well respected Q Meter (TF1245) along with accompanying Oscillators (TF1246 & 1247), they were not far behind Boonton in this and published their own booklets on Q Meters and principles of measurement.

Worth a look, if anyone needs to see the manuals they are on the various archive sites as well as ours.
Just my 2p worth
Regards
Nigel Adams - Marconi Instruments Heritage Collection

I did place a bid one of the Marconi instruments, but the highest bidder bid ?1 more than me. There's another on eBay UK, but that lacks a source, and the source is unusual as the output impedance is low.