The way you register to vote is changing and there will be two registers, one for electorial purposes and an 'Open' register.
The Government website GOV.UK says, 'Most people who are already registered to vote are being moved onto the new system automatically. So you may not need to do anything.' and 'look out for a letter from your local council in July or August'
The letter being sent to constituents in our borough states 'Your details are on the open register', this means your details can be bought by any person, company or organisation.
If you wish to be removed from the open register you must contact your local authority's electoral registration officer and asked for it to be removed.
Go here to find the telephone number of your local authority's Electoral Registation Office