My "better half?" bought one of these cheap (~£20) small cold frames.
For planting out a pot of mixed lettuce from the supermarket it's OK.

It consists of panels of double skinned plastic extrusion glued into a
slot in an aluminium extrusion frame - and on one of the lid elements
this glue has failed. Can someone please make suggestions as what
glue would be suitable for this.

Thanks
Rob