Mr Parker. The insulation grants can apply to both loft and cavity of a property and loft and cavities on there own, so there should be no problem with your application. We have a range of external wall insulation available (not through grants I'm afraid!) and i would be happy to put you in touch with one of our technical advisors who would be happy to discuss this with you and provide any quotes. Please send any details to enquiries@eviee.co.uk and i'll have the technical advisor make contact. Thanks!