Sir; I wish to question the recent advert featured in the Grocer, March 3, where ZigZag papers claims to be the UK's No2 brand'. The source quoted is Zigzag data'. We at Swedish Match market the Swan Brand of smokers accessories where we are number one in filters and number two in papers [Source AC Nielsen RAL]. I would be interested to know how Zigzag can substantiate their claim. Duncan Kerr Trade marketing manager Swedish Match UK sales {{LETTERS }}