So at practice tonight I took 2 bass guitars with me.
The noise was not as prominent however it did occur, this time on E. I did film it however I don’t know how to upload it on here :/
Interestingly when it happened I switched guitars and low an behold the same thing happened on the E.
I now am pretty sure it’s not the guitars causing the problem. I also have a sans amp pre amp which I switched to which made no difference. I should probably mention that the pedal did not bypass the amplifier so would have still been affected by the amps eq, volume etc.
From advice from Reedt2000 I screwed my pickups in a bit before practice.
Once again the noise sounds like a sustain pedal noise and which continues slightly after the string has been muted.
If anyone has any advice on how to upload videos let me know.