Look at the lists! You would need one of those concertina credit card wallet things, with 20 or more pockets filled with "stuff", which you take with you everywhere (big bag or wheelbarrow required) so that you have some proof to cover virtually any eventuality.
Or you can have one, just the one, tiny little ID card.
Shell, your Citizen ID card only lasts three years - £15 a go at present prices. It would have been cheaper to renew your driving licence if you intend to live another nine years or more.