Our competition to spot the four changes we think we made to the Garkau Cow Shed, Lübeck, caused much debate (Letters, page 14). After some thought we've decided to award the bubbly to John McKean of Brighton, whose answer appears on the Letters page. This week, can you spot the three changes we've made to Gaudí's Casa Battló, Barcelona? Post your answers, to arrive by Monday morning, to AJ Ring the Changes, 151 Rosebery Avenue, London EC1R 4GB, or fax 020 7505 6701.
The first correct entry pulled out of the hat wins the bubbly.