I registered mt home telephone number with the "telephone preference service" a couple of years ago and that seems to have got rid of the majority of UK nuisance calls. Unfortunately the majority of scammers now use I nternational or witheld numbers to get round the legislation. Recently purchased a BT6500 phone which allows you to block Int'l, witheld, and upto
20 individual numbers. Calls are diverted to the answerphone so only legitimate contacts leave a message. I've now managed to reduce my scam calls from 3-4 a day to to almost nil. Worth a look!