@Kevin K not sure from your message if i offended?! i sincerely thank you for the solution you offered and i may well use it in future, but after trying michaelk's solution just now ive found that's got the result i need, i wasnt saying i felt id have to use your textures just that i dont have a need to texture the exterior or make it look like a roof in any way from outside, ill have a go with the roof tool, perhaps its still relevant to my need
(as for the uni part, this is a project for my university course, design for film and television)