Home DIY

Maybe a catnic type lintel. I've fitted curtain rails and blinds to these by drilling with a HSS drill and using self tapping screws. Alternatively drill a 6mm hole and use regular plugs and screws. 6mm rawlplugs are around 30mm long. If the plaster is a bit crumbly you could 'build' the plugs in with a bit of filler or no nails.

Also the lintel could be U channels on their side and not an I beam.

Thanks man, from the pics i've just googled this would appear to fit the bill. HSS drill it is.