I posted this on 13 October but my mail program reported it 'removed'.

I'm looking for a 'Platform Ladder' (the ones that allow the platform to be
set at a different height on each stile for use on stairs) but one that is
higher than the usual 6 rungs. Machine Mart have a 7 rung item which claims
platform height up to 1.3 metres.
Is there anything of this nature which is higher? I've tried the UK
suppliers which Google throws up but have not found anything higher.
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Any help TIA
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