Now onto production.
Demo:
Summary
I recorded a demo of the song. This was me playing the piano and singing. I used a single condenser mic to pick up both piano and voice. Then into Logic Pro on my iPad via my Presonus 24C Audio interface. Interestingly I wanted to do the chorus at about 135bpm and verses at about 130bpm. I compromised at (as I recall 133bpm). I played to a metronome / click in Logic Pro - the sound engineers I know think this is a “must do” for studio recordings.
Drums:
Summary
I then exported the track and sent it to my son (Jake) to add drums. I asked him to do a “straight” and a “funk” version. The 2 of us decided to use the straight version. The drums you hear on the final version are from this original take by Jake (ooh a bit of poetry too 
)
Side note: although we both use Apple programs (Logic and Garageband) and gear (iPad and Mac) we weren’t able to collaborate directly on the project, which seems a bit odd. Hence each of us had to export and share the files for import into our respective DAWs.
Bass
Summary
I then worked out a bass line and recorded it. I figured that once I had the drums and bass (so the rhythm and the groove) it would make the guitar and redo of the piano part easier.
I asked Jake to listen to the project with the bass line. He thought the bass line was good and helped to bring the song along.
The bass is recorded via an Origin Effects Bassrig Super Vintage pedal (the Ampeg SVT emulatot) using the in-built 8 x 10 cabinet. I have some compression on prior to the pedal.
Guitar
Summary
I did the guitar part assuming that the guitar player in my band would probably do the guitar part, or maybe a lead part over my rhythm guitar. He didn’t have any suitable recording gear though (other than a US Fender Strat ). Hence the guitar part I originally recorded is the one you are hearing.
I played my PRS 24-08 SE. I’m guessing I had the neck pick up on humbicker and the bridge on single coil, but I od’nt really remember. I set the guitar up to have a bit of overdrive via a JHS 3 series distortion pedal with the gain set relatively low, so that it’s more like an overdrive. I may have put a Bad Monkey (a Tube Screamer type pedal), again with low gain into the distortion but don’t recall. I had a slapback delay to thicken the sound a bit then into a reverb, probably on a plate setting. I then went into Logic via the Origin Effects Super Vintage with the cab sim on. The Super Vintage is on the point of break up if I was playing clean into it. I think the bass pedal works pretty well for guitar - an Ampeg SVT was good enough for Keith Richards so it’s good enough for me (for now).
Side note: I needed fewer takes on guitar than I did on either bass or piano, both of which I play better than guitar. Probably something to be said for keeping things simple.
Vocals
Summary
Vicky, the singer in our band (“In Progress”), performed the vocals. We did this in my home studio. I used an SM58 vocal mic. I was thinking for a while that I should have used a condenser mic - but I think it’s turned out pretty well with the SM58.
Vicky’s vocal level was more variable than I would have liked during the recording. I tried using a compressor at the time of recording, but I wasn’t competent enough to do it at the time we recorded, so I hoped I could fix it post recording.
Prior to the recording the only vocals were the demo I did. Luckily we could just about get the level right that Vicky could hear the piano (she wanted it) but wasn’t distracted by my vocal (which was on the same track as the piano) - I think this was the bit of luck the production process needed.
Piano
Summary
I used a condenser mic. The placement was dictated by where I could pick up enough signal. I could have done it on my Roland keyboard, but wanted the acoustic piano so I had a bit more control over the dynamics. I think the noise at the start and end of the recording is probably due to having the Audio Interface input gain almost at max to get enough piano signal (I haven’t actually checked). I may make different piano recording decisions if there is a next time.
At this stage all the parts were done. I was able to mute the demo track at this point.
Mixing
Summary
I mixed to what I thought sounded good, or at least as good as I could get it. The main problems were the low F on the bass of the 1st note of the chorus (too loud and a bit overwhelming); and the dynamic range of the vocal. I used compression on the bass and vocal tracks to control this. I then went through the drum, guitar and piano tracks and put compression on each of these. The bass had the most post compression on it - it was also the only one that had compression on the way in.
I tried reverb on Vicky’s vocal and the overall recording, but neither made it sound better (to my ear)
I then exported the mix for Vicky and Jake to listen to. They were both happy with it.
At this point I was happy with the recording and thought it was finished. However…
Mastering
Summary
Something @LievenDV said on the thread I mention in the OP sent me down a bit of a music distribution rabbit hole. One of them (Ditto) had an article on mastering. It convinced me to give their Artificial Intelligence based mastering tool a go. You upload the file, it does the mastering, you listen to it; you then have the choice to pay for $5 to download it or do nothing. I thought it improved the recording.
And the result is the recording I have posted to SoundCloud.