Thanks very much DeeJay. Very valuable information indeed. I knew there'd be some sort of post on here but I couldn't find anything. Thanks for pointing me to your previous post, and enlarging the pics.

About an hour after I posted, I came across the same mower (Ebay ad) and it fortunately had a catcher. Here are the pics.

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After looking at the pics you provided, and comparing them with the pics of the Ebay mower, I'd be leaning towards J00271 - that's if the one in the Ebay ad has the correct catcher. J00354 also looks suitable. Both catchers have a "latch" type arrangement at the top/front which the mowers flap hooks onto. Thanks again so very much DeeJay. Your time and effort is very much appreciated. Regards - Peter.