Rolls Royce Avon

[Keep it stiff]

Can anyone tell me where the the Avon engines were built that went into the Lightning?

I see from Wiki and other pages that the Avon was built in many locations and I know it went into many aircraft types but I can't anything that ties down which manufacturing plant supplied to which aircraft.

[Keep it stiff]

I thought perhaps there would be a connection with Bristol, the clue being in the name!