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The night before this one (yes I am up in the middle of the night checking my torrent) I was getting download speeds of over 100kibs and an estimated finish time of around 14 hours.
Since yesterday morning my download speed has dropped dramatically and varies between 0 and 10.

However my upload speed is consistently just under 50kibs which is where it is limited.

My share ratio is listed as 0.35.

Given that I have been uploading at 10x or more speed than downloading for around 24 hours now, how come my share ratio is so low?

Also before I restarted qBitTorrent in the hope that might help, the peers list for the torrent showed much bigger numbers for upload than download for most peers. There were a couple of obvious seeders where I had downloaded a few hundred Mb and uploaded 0.

I only have the one torrent, my first ever.

Additional: I just set up my routers NAT settings. Upload rate remains at around 50 kibps but my download rate has increased dramatically. I thought incoming connections were only for upload?

I also increased upload slots to 20. I expect this to mean that more peers will get less data from me. Is that right? Should that increased my download rate?

I'm sure the ratio is correct, it's based on how much currently downloaded to how much currently uploaded. Say you had any torrent, you currently downloaded 100MB so far and uploaded 35MB this is a "perfect world" 0.35 ratio... though I doubt you've seen these exact numbers.
No, lol, incoming connections are not for upload, incoming connections are for download.
And yes, number of upload slots means more people get less of your allotted upload rate. I've rarely, if ever, changed the values here, mine is set at 6 per torrent, I would think the opposite would give you better download rate as long as the other peers are communicating with each other properly. They "see" another peer completing pieces at a faster rate they "should" allot more of their upload speed to you, rather than you sending out more pieces and, in general, taking longer to complete. You'll also more rarely than not come across peers with faster download rate than your upload rate.