You'll need the certificate as part of your homebuyer pack when you come to sell the house, or buyers will be very wary.
Cheers!

The current one is technically a consumer unit (according to my Collins Handy DIY book, anyhow) - but an older one. But yes, I'd rather have an upgrade - apart from anything else, the current one doesn't have space for a power shower line, should I decide to have one installed.