November is Will Aid month, where you can get your Will drawn up by a local solicitor in return for a voluntary donation to charity - I did this a few years ago. Probably time to take advantage of this offer and update it though!
During Will Aid month participating solicitors won't charge you for writing a basic Will. Instead, they will invite you to make a donation to Will Aid's nine charities. The suggested voluntary donations are £95 for a single Will, or £150 for a pair of 'mirror' Wills.