I found this BBC report on the early RP2/6 just to give some idea of the typical nature of internal gubbins and construction!
I also found a BBC Engineering Design Information sheet which describes the new RP2/10:
BBC EDI wrote: New Design
RP2/10 Disk Reproducer for new installations and to supercede obsoloete equipm,ent as appropriate. Table top cabinet;floor standing adaptation using separate plinth. Single player 33/45/78 stereo and mono. Turntable, pickup arm and associated controls as RP2/9. Uses present standard Shure SC-35 cartridge; LP or 78 stylus assemblies.
Modular organisation for installation in bespoke desks and to permit choice of facilities with electronics to match.
Replaces RP2/6. Two units on plinths may replace RP 2/1 types. EDI No.10354 Refers.
For further information please contact W T Shelton, Room 302, Western House PABX LBH 3867.
This EDI is available here: http://www.bbceng.info/EDI%20Sheets/10358.pdf and gives brief descriptions of the earlier RP types.
And, much more importantly, the EDI 10354 mentioned above details the RP2/10 specifications and its optional facilities here: http://www.bbceng.info/EDI%20Sheets/10354.pdf
In particular, it mentions the outputs are via Hypertac connections...
I've also discovered there were at least four variants identified as the basic RP2/10, and then RP2/10B, C and D.
The basic RP2/10 was a 'minimum facilities' version for Continuity suits, but included the scratch filters, switched output attenuator, and groove location.
The -B version was a 'Full facilities' model for Radio and External Broadcasting with stereo/mono switching, RSA (EQ), scratch filters, rotary fader, headphone amp, main and aux output amps, and groove location.
The -C model was also 'full facilities' intended for Television Studios, with stereo and mono switching, rotary fader, RSA, scratch filters, line amp, bussing mixer, and groove location. (The bussing mixer allowed multiple replay sources to be linked together to produce a single combined output which could then be passed to the main mixing console.)
And finally, the -D model was a mono reproducer with only a single channel of electronics. It included the rotary fader, RSA, scratch filters, headphone amp, and main and aux output amps.
And... if you're interested in the pickup arm -- the MP1/18 -- that's described here: http://www.bbceng.info/EDI%20Sheets/10381.pdf
It was designed specifically for the SP10 Mark 2 turntable... and an optional pickup raise/lower mechanism for it was coded the MP1/19.
The aluminium tube arm has an effective length of 248mm, an overhang of 15.4mm, a resonant frequency (with standard cartridge) of 14Hz, and a tracking error of +3 to -1 degrees. The blurb gives the stylus pressure range as being from 1.5 to 6.5 grams.
I've not yet been able to find any schematics for the electronics, although I have confirmed that the pickup amplifier is a type AM18/17, and the RSA module is a type AM22/14.