A cover plate (100; 200) for mounting to a mounting area on a turbine vane, the mounting structure having a plurality of tiers including an upper tier and a lower tier, said cover plate (100; 200) comprising: a base level (102; 202) defining a base area (108; 208) having a lower attachment surface (110; 210) for positioning proximate a first mounting surface on the lower tier of the mounting structure; an intermediary portion (106; 206) coupled to the base level (102; 202); and a flange level (104; 204) formed in peripheral relation to the intermediary portion (106; 206); characterised in that: the flange level (104; 204) includes a flange area (118; 218) including a first flexible wing (132; 232) and a second flexible wing (132; 232), each of the first flexible wing (132; 232) and the second flexible wing (132; 232) having a lower flange surface (134; 234) for positioning proximate a second mounting surface on the upper tier of the mounting structure; and by further comprising: a joint (128; 228) extending from the base area to (108; 208) the flange are a (118; 218) through the intermediary portion (106; 206), the joint (128; 228) forming a gap (130; 230) that separates the first flexible wing (132; 232) and the second flexible wing (132; 232); and a weld (138; 238) disposed in the gap (130; 230) with a first end (140; 240) proximate the base area (108; 208) and a second end (142; 242) located a relative distance (144; 244) from an outer edge (120; 220) of the flange area (118; 218), the relative distance (144; 244) permitting relative movement between the first flexible wing (132; 232) and the second flexible wing (132; 232). a base level (102; 202) defining a base area (108; 208) having a lower attachment surface (110; 210) for positioning proximate a first mounting surface on the lower tier of the mounting structure; an intermediary portion (106; 206) coupled to the base level (102; 202); and a flange level (104; 204) formed in peripheral relation to the intermediary portion (106; 206); characterised in that: the flange level (104; 204) includes a flange area (118; 218) including a first flexible wing (132; 232) and a second flexible wing (132; 232), each of the first flexible wing (132; 232) and the second flexible wing (132; 232) having a lower flange surface (134; 234) for positioning proximate a second mounting surface on the upper tier of the mounting structure; and by further comprising: a joint (128; 228) extending from the base area to (108; 208) the flange are a (118; 218) through the intermediary portion (106; 206), the joint (128; 228) forming a gap (130; 230) that separates the first flexible wing (132; 232) and the second flexible wing (132; 232); and a weld (138; 238) disposed in the gap (130; 230) with a first end (140; 240) proximate the base area (108; 208) and a second end (142; 242) located a relative distance (144; 244) from an outer edge (120; 220) of the flange area (118; 218), the relative distance (144; 244) permitting relative movement between the first flexible wing (132; 232) and the second flexible wing (132; 232). the flange level (104; 204) includes a flange area (118; 218) including a first flexible wing (132; 232) and a second flexible wing (132; 232), each of the first flexible wing (132; 232) and the second flexible wing (132; 232) having a lower flange surface (134; 234) for positioning proximate a second mounting surface on the upper tier of the mounting structure; and by further comprising: a joint (128; 228) extending from the base area to (108; 208) the flange are a (118; 218) through the intermediary portion (106; 206), the joint (128; 228) forming a gap (130; 230) that separates the first flexible wing (132; 232) and the second flexible wing (132; 232); and a weld (138; 238) disposed in the gap (130; 230) with a first end (140; 240) proximate the base area (108; 208) and a second end (142; 242) located a relative distance (144; 244) from an outer edge (120; 220) of the flange area (118; 218), the relative distance (144; 244) permitting relative movement between the first flexible wing (132; 232) and the second flexible wing (132; 232). a joint (128; 228) extending from the base area to (108; 208) the flange are a (118; 218) through the intermediary portion (106; 206), the joint (128; 228) forming a gap (130; 230) that separates the first flexible wing (132; 232) and the second flexible wing (132; 232); and a weld (138; 238) disposed in the gap (130; 230) with a first end (140; 240) proximate the base area (108; 208) and a second end (142; 242) located a relative distance (144; 244) from an outer edge (120; 220) of the flange area (118; 218), the relative distance (144; 244) permitting relative movement between the first flexible wing (132; 232) and the second flexible wing (132; 232).