It looks like the data returned is in JSON/YAML format.
I think you're onto something. The WebService::Tesco::API POD does not say, but looking through the source code, product_search eventually calls get... 
sub get {
...
return JSON->new->utf8->decode($res);

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In reply to Re^2: Data from a Hash/Array by toolic
in thread Data from a Hash/Array by foggy3657

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