My dad and I went though his Lego from when he was a kid and we managed to build his weetabix castle, he used to collect vouchers from the cereal boxes. It
BrickLink - Set 00-2 : LEGO Weetabix Promotional House 1 [Legoland:Building] - BrickLink Reference Catalog
Rare Lego 1592 Town Square - Castle Scene from 1980 w/Instrux - Weetabix Promo! | #1853715044
LEGO VINTAGE WEETABIX castle - £37.00 | PicClick UK