Sorry to hear about your health problems and your prognosis. I was mildly bemused to read about your health condition in one breath, juxtaposed with excitement about Hawes & Curtis!
A little bit of synchronicity, because I was reading SF on my iPad and thinking about this thread - whilst reading about RTW shirts in London - as my tube pulled through Brent Cross en route home (NW London to East London) from work.
I have only within the last year bumped up my shirt collection. It is now circa 13.
Charles Trywhitt: 2 plain French cuff (white and light sea blue). I never wear the white anymore, but I do like the light sea blue feel.
Harvie & Hudson: 2 plain French cuff (pale duck egg yellow and mid blue). Unfortunately, half an inch too big all over because I didn't measure. Am 16/34. Best shirts I own in terms of fabric and buttons, but fit is the most billowing - even accounting for my size malfunction.
Hawes & Curtis: 3 herringbone French cuff( light blue, mid-pink and a mid-yellow) to be sent to goodwill. Albeit, I'm wearing the light blue as I type as I forgot to launder my shirts yesterday.
Stephen Haroutunian: 5 (2 light blue dress shirts - dress cuff - and 3 button cuff in light blue, pale pink and small mid-blue / white gingham). Excellent value at 3 for £80. Fabric and buttons are not as good as Harvie & Hudson and slightly thinner cotton, but fit is reasonable (still needs alterations).
TM Lewin: 1 turquoise large gingham button down (slim-fit).
I'll be taking all of the above (except Hawes & Curtis) to be altered (take in sides and tailor sleeves @£24.50 each shirt. Ouch!). I'll try Stephen Haroutunian's £89 MTM fabric range to determine the fit.