Same happens for me too.. I've raised it with the developers and it'll hopefully get fixed soon.
It seems to be up and running again now!
Over the last 24 hours a have been getting constant error through up, even if it try query through the interactive API documents, I get the following response;
<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Text xml:lang="en-US">The endpoint reference (EPR) for the Operation not found is https://uk.farnell.com/pffind/services/SearchService and the WSA Action = http://uk.farnell.com/pffind/services/SearchService</soapenv:Text>
Seems to me to be some kind of serverside problem, can anyone shed any light on this?