Scammers. This number 08001836408 keeps calling me claiming to be XXXXX but it's always a foreigner and they want me to tell them my details (address etc) saying it's to confirm who I am lol. If it was genuinely XXXXX they would not be asking for any details as they would already have those details. Blatant scammers so beware, never ever give your details to ANYONE over the phone, no matter how trivial those details may seem or what reason the caller gives for wanting them.