RCD protection 

Modern homes are expected to have 30 mA RCD protection on: socket circuits (≤32 A), lighting circuits, cables buried in walls, and any circuits serving or passing through bathrooms. If your board is older and lacks RCDs, upgrading is commonly recommended for safety. Also worth mentioning is the type of RCD with many applicances with the home now creating DC currents these can cause older RCD's to become blinded and fail to detect faults. Type A RCD's are designed to counter this.

Metal consumer units

New/renewed domestic fuse boxes must be in a non-combustible (usually metal) enclosure to help contain any internal fire. This rule has been in place for years and still applies. 

Surge protection (SPDs)

Protection against voltage spikes is now required in most installations unless you (the owner) formally accept the risk, or specific conditions mean it’s not needed (more common in small, low-risk dwellings). Many boards now include an SPD as standard. 

Arc-fault devices (AFDDs)

These detect dangerous arcing (which can cause fires). They’re mandatory in certain higher-risk residential buildings (e.g., some multi-occupied or special-use settings) and recommended for others; Forty 7 Electrical will advise based on your property and use. 

Bathrooms & outdoors

Bathrooms have “zones” that restrict what can be installed and usually require RCDs; outdoor sockets should be RCD-protected and suitably weather-rated.