Dear Sam and Larry, Thanks for your comments. I've currently been using a Square Shooter 2 with type 88 film, the peel apart kind. I've only used it successfully out of doors but have found I can manipulate the image in various ways e.g. pressing on the unpeeled film preventing areas of the image from exposing. I pressed on an image of the sky over Coventry creating a 'tear' in the heavens.
Would like advice on adapting an SX70 for pinhole and using Polaroid in standard oatmeal box type cameras. What Polaroid film would you suggest? Mark