If you want a gold aprroved electricians card you need a all of the above!!
As for the competent person scheme its your choice. Depends what work your going to be doing as you said you would be working on your own home then all notifiable work will have to submit a building notice to the local authority before starting work and pay the fee around (£140) to have the work inspected.
Non-notifiable electrical work covers
Replacement of fittings such as sockets, switches and light fittings.
Replacement of the cable for a single circuit where it has been damaged.
Work that is not in the bathroom or kitchen and consists of
Adding additional lighting, light fittings and switches, to an existing circuit.
Adding additional sockets and fused spurs to an existing ring or radial main.
Installing additional earth bonding.
All other work must either be carried out by certified individuals/companies or notified to the local Building Control before work begins. this includes All new or modifications to the electrical wiring within bathrooms or shower rooms.
Installation or modification of electric underfloor or ceiling heating.
Garden lighting or power installation.
Other specialist electrical installation, examples being, Photovoltaic Solar and micro CHP.
Boiler Controls timers/roomstats ect..