Was sacking the senior official over Mandelson's failed vetting the right call?

Peter Mandelson failed security vetting for the US ambassador role announced in December 2024, with the report recommending against clearance. The senior official, Sir Olly Robbins, was effectively sacked after not informing PM Starmer sooner. Starmer called the lack of notification 'staggering' and 'unforgivable', while Lord Simon McDonald defended Sir Olly for following process.