Shirts? With collars? I remember those at work.
I always found TM Lewin as you describe your recent experience OP. Bad fit.
I tried Paul Smith a couple of times. More expensive, no better, and in some cases very poor.
Charles Tyrwhitt I tried on occasion. OK, not great.
In the end I settled on M&S again as I had way back in the past.
And then I just stopped wearing shirts as they’re uncomfortable, expensive, and usually need ironing. I ended up wearing long-sleeved black Ts, sweaters, hoodies, and that sort of thing.
The only shirts I now have are some Aloha short sleeved ones, a dark green one for any formal events, and that’s it.
A few friends got tailored shirts but IDK, seems like a faff.