Bands

Oblivionized

United Kingdom · Technical Brutal Death Metal (early); Mathcore/Grindcore (later)

Omnifear

United Kingdom · Deathcore

Onryō

United Kingdom · Atmospheric/Post-Black Metal

Operation Cunt Destroyer

United Kingdom · Slam/Brutal Death Metal/Deathcore

Ophidian Ritual

United Kingdom · Black Metal/Noise/Ambient

Pale Shroud

United Kingdom · Black Metal

Pallid Mask

United Kingdom · Thrash/Sludge Metal

Pandion

United Kingdom · Melodic Black Metal

Paybak

United Kingdom · Death/Thrash Metal

Perisher

United Kingdom · Raw Black Metal (early); Atmospheric/Post-Black Metal/Shoegaze (later)

Perpetual Infestation

United Kingdom · Death/Thrash Metal

Perpetual Torment

United Kingdom · Death Metal

Pete Wadeson

United Kingdom · Progressive Metal, Shred

Phlefonyaar

United Kingdom · Death Metal/Grindcore

Phyrexia

United Kingdom · Death/Black Metal

Possession Demonic

United Kingdom · Black Metal/Grindcore

Primitive Vices

United Kingdom · Stoner/Sludge Metal

Root Zero

United Kingdom · Progressive Metal

Sacred Ritual

United Kingdom · Black Metal

Sanctorum

United Kingdom · Melodic Death/Thrash Metal

Sanhedrin

United Kingdom · Black/Death Metal

Sanity Reigns

United Kingdom · Death Metal

Scorched Flesh

United Kingdom · Black/Death Metal

Send More Paramedics

United Kingdom · Thrash Metal with Hardcore elements