Right so this is actually more interesting than most of the "shadow figure" posts we get on here, mainly because you've got footage rather than just a description after the fact.
Few things I'd want to know though. What time each night did it appear? Consistent timing across three nights would be significant, could point toward a time slip echo rather than a random manifestation. I've been looking into residual phenomena around Salisbury for a while now and temporal consistency is one of the markers that separates genuinely odd cases from camera artefacts and pareidolia.
Also what's the camera setup - IR night vision, or just a standard phone propped up? Because IR can do some genuinely weird things with reflective surfaces and moisture in the air, and I'd rather rule that out before we go any further.
Not saying it's nothing. Three consecutive nights is a pattern and patterns matter. But post the raw footage if you can, not just screenshots. Screenshots are basically useless for this kind of analysis.