OK. If Building Control are involved and there's any significant load on the lintels they'll want calculations for any solution that isn't a manufactured lintel with a spec sheet. Best bet- talk to your bco, see if he/she will offer an opinion (I've had several successes with this method)
Cant see there being any significant loads on them. Most therell be will be 2.8m high gabled peak on top with an 8m span. With trusses, the truss takes most the load rather than the gables seeing theres no purlins into the gables.