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I originally asked the question. I bought panels from these guys
https://www.gardentrellis.co.uk/fixed with wall plates using this method
https://www.gardentrellis.co.uk/page/store/guides/face-fixing-for-trellis-and-slatted-panels
https://www.screwfix.com/p/easydrive-countersunk-concrete-screws-7-5-x-100mm-100-pack/3839hOn a slightly dodgy wall it was fine, even for an incompetent like me. Need small bits of wood to shim the wall plates though.
Thanks for the reply, I'll have a search later in the week. I guess it relies on the integrity of the wall somewhat.