DD will be 19m when no. 2 arrives in Sept. She's nowhere near walking yet so I don't suppose she'll be too much of a pro by then and I've resigned myself to a double buggy (though will probably make use of sling + stroller in the early days).
All thoughts on what's best out there at the moment gratefully received. For DD we bought a Mamas & Papas travel system just before the Bugaboo craze took off and felt very yesterday! (Not looking for the latest celeb gimmick tho, just whatever's best.)