i also had the same problem with mammas and pappas while expecting twins last year i brought 2 cots and the spring best quality mattress they had .on the cot the holes for the srews for the base were not lined up and the matttress whent a disgusting yellow clour .the shop said because my baby had sleep in it their nothing they could do .i also brought the twin aria buggy AND WOT A LOAD OF RUBBISH THAT WAS it was fine when the twins were small but as they got older it was crap to push and the basket under neath hung on the floor  even with the lightest of things init .it took me ages to save up for these thinking that they were from a good shop but how wrong can u be .mothercare are just about the best place to go NOT MAMMAS AND PAPPAS