retractable lap beltmeans a lap belt with either an automatically locking retractor (as defined in paragraph 1.8.3 of Annex I to Community Directive 77/541) or an emergency locking retractor (as defined in paragraph 1.8.4 of Annex I to Community Directive 77/541);”
the principal Regulationsmeans the Motor Vehicles (Construction and Use) Regulations (Northern Ireland) 1999.