A range of important documents can be recorded in the Work Document area such as Drivers License, MOTs, insurance, Passport and Visas.  Each one with an expiry date.

When looking at your list of People the Super Filter (in the search area) can look for any Work Document that are expired, expiring in 8 weeks or 4 weeks and just show any people it finds.  The date(s) that meet the Super Filters criteria are highlighted in red, orange or yellow to clearly show the offending document and the urgency of its renewal.