Sorry, I realised I didn't have the esp8266 chip connected.

After connecting, here is brief output:

[26645.130953] usb 2-3: new full-speed USB device number 13 using xhci_hcd
[26645.283500] usb 2-3: New USB device found, idVendor=1a86, idProduct=7523, 
bcdDevice= 2.54
[26645.283508] usb 2-3: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[26645.283513] usb 2-3: Product: USB2.0-Ser!
[26645.285027] ch341 2-3:1.0: ch341-uart converter detected
[26645.285578] usb 2-3: ch341-uart converter now attached to ttyUSB0
root@butterwicks-five:~# lsusb
Bus 001 Device 002: ID 8087:8000 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 004: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card 
Reader Controller
Bus 002 Device 003: ID 1bcf:2c6e Sunplus Innovation Technology Inc. HD WebCam
Bus 002 Device 005: ID 04ca:300d Lite-On Technology Corp. Atheros AR3012 
Bluetooth
Bus 002 Device 013: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@butterwicks-five:~#

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https://bugs.launchpad.net/bugs/1946796

Title:
  ch341 communication problem from kernel.org

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