There's a lot more going on on the other site, but (as I have a filled grid) nothing there helps with the theme. The unusual requirement of space = 27 means that there are only 6 letters in the writer's name, and unless there's an Arabic write al something there's only one writer I can identify (with no relation to Bognor Regis, so bugger Bognor). I take it that the hint given by the down letters is to a work by someone else as my man didn't write novels as far as I can see. So a hint (VERY GENTLE as Malone insists, but a hint nevertheless, would be welcome). I had his most famous poem pinned up on the kitchen notice-board when my kids reached their teens. I hope it helped - they seem normal 50+ year olds now.