toggler / snaptoggle HEAVY DUTY UK M6 wall anchors not the 1/4 or 3/16 US version which no uk bolts will fit like many sold on amazon, THESE ARE THE BEST FIXINGS
SNAPTOGGLE | Heavy Duty Toggle Bolts | Heavy Duty Wall Anchors
TOGGLER 802-lb 3/16-in x Assorted Length Toggle Bolt Drywall Anchors with Screws Included (10-Pack) in the Anchors department at Lowes.com
Snap-Toggle - Reliable Fasteners
Toggler Anchor System 25013 - SnapToggle® 3/16"-24 Toggle Bolt - Box of 50 | Hardware Hut