Snatched from Collectors Guide:
As Motörhead were endlessly touring, Bronze released this four track 7" and 12" live EP as something of a stopgap whilst waiting for Ace of Spades to be delivered. Radio stations refused to play it so Bronze released a 2 track remixed version, containing Leaving here and Stone deaf forever , as a promo only. Meanwhile Holland and Germany put it out on 7" and 12" in a different sleeve as Lochem pop 80, a tie in with the festival of the same name the band were booked to play at.

From Motorheadoverkill.se
The recordings on this EP were made during the Bomber tour in 1979 but I have never seen any information about what gig it really was. Four songs were included on a 7" 33 rpm format as well as on a 12" 45 rpm. A very interesting question is if more songs were recorded at the time. I have never seen any live recordings that were claimed to be from the same concert. It was released in April in 1980 and was produced by Nicholas Raymonde.

The name of this Live EP is not a choice by Motorhead at the time but it was decided by Bronze. Lemmy has in retrospect said that it also proved to be very true, those years were golden years, but it was an odd choice for a title at the time. Motorhead wanted to call it "Flying Tonight".

The record climbed the charts but the radio would not play it. They said the vocals were too low mixed and that the sound was bad in general. That is why a special DJ promo release was made on 7" with only two songs included and with a new mix. This did not help, radio would not play it anyway.

This is the best answers I can dig up for you at this point, sorry for not being able to give you a straight answer on "when".