What are the minimum qualifications for an electrician to be able to provide Electrical Installation Certificate (EIC) or a Minor Electrical Installation Works (MEIW) Certificate in Commercial Premises

If a company is looking to sub contract out work to install commercial catering equipment (single and 3phase) and the installations are highly likely to require appliances to be hard wired to a fixed socket and/or have to install an RCD, what are the minimum qualifications for an electrician to be able to provide Electrical Installation Certificate or a Minor Electrical Installation Works Certificates in Commercial Premises?

I have seen qualifications showing city of guilds level 3 award in Requirements For Electrical Installations (doesn't say diploma) with 3 years experience but I'm not sure if these individuals can issue an EIC or MEIW?

Any guidance greatly accepted.

Many thanks