Ronan Crix

It can be seen at the left corner of his pedalboard

He uses it with a Marshall head and a Fender amplifier at this live performance. Pause the video around 0:08 and 0:31 and you can catch a view at his amps.

It can be seen on his pedalboard

Regarding the recording of Promise Everything: "Ronan used the Jazzmaster and it has such a bright sound and then from the Les Paul we would have that really nice warm, kind of gritty sounding rhythm track.”

In a photo shared on Instagram by @basementuk, Ronan Crix's Electro-Harmonix XO Stereo Pulsar Variable Shape Tremolo is visible next to a Big Muff pedal.

In the YouTube video titled "Basement Pine Acoustic," Ronan Crix can be seen playing a Fender Telecaster live.

It can be seen at 2:27

you can see the pedals in the picture from Basement's Instagram

you can see the pedals in the picture from Basement's Instagram

you can see the pedals in the picture from Basement's Instagram

you can see the pedals in the picture from Basement's Instagram

He can be seen holding it at this photo.

In a photo shared by Basement on Facebook, Ronan Crix is seen with a Fender Kurt Cobain Signature Mustang in Fiesta Red.

In the YouTube video titled "Recording Further Sky 2014" by Run For Cover Records, at the 0:22 mark, Ronan Crix is shown playing a Fender 1962 Jaguar in Olympic White.

you can see the pedals in the picture from Basement's Instagram

you can see the pedals and power supply in the picture from Basement's Instagram

Ronan has been using his Tobacco Burst Les Paul pretty regularly since probably 2017-2018. It has a nickel cover bridge pickup, but regular neck pickup. You can see it most recently in this video through the whole set, but most clearly at the beginning of "Whole" at 3:40.