So, the original question was;
"Are the majority or landing pads round or square? ... I'm referring to raised pads, verus ground level."
After many posts about aligning machines with pad edges & 'H' markings and mention of multi parking on the pads, Shyt answers with, "The one at LHR is triangular. Now how confusing is that?
"
Very confusing especial as it is at ground level, glad my link was useful though
We'll ignore the remark; "… it is surprisingly the only helipad at that (LHR) airfield."