Morrissons have a 28mm Helicopter for sale at £2.50. Scale is somewhat debatable but I would put it around1/50 to 1/48 so would fit most ’28’mm heroic zombie game figures such as Zombicide etc.
The model is a die cast Service Helicopter with security decals and an emergency recovery ‘boat’ (unsure how best to describe it).
It appears that there is a second helicopter for a TV company available (but not yet seen).