Related Clues:

• Logical conjunctions, in mathematics
• It's what you pay extra for to organise dad to pick up son
• Bill riders, for example
• Contract extras, and read differently, a hint to this puzzle's theme
• Back-of-the-book items
• Extra charges
• Clause joiners
• Different from those already mentioned
• Companion of ifs and buts
• Add-on features
• Other considerations
• That girl behind old book takes point from the rest
• Scanners, webcams, etc
• Luxury extras
• Everyday connectors