(S (S (S (NP (BASENP (DT The) (NN possibility)) (PP (IN of) (NP (NP (BASENP (JJ further) (NNS talks)) (PP (IN with) (BASENP (DT the) (NNP Royal) (NNP Mail)))) (SBAR (IN before) (S (VP (VBG undertaking) (BASENP (NN action)))))))) (VP (VP (VBZ has) (RB not)) (VP (VB be) (VP (VBN ruled) (PRT (RP out)))))) (COLON ;) (S (NP (BASENP (DT any) (NNS walk-outs)) (PP (IN in) (NP (BASENP (DT the) (NN run-up)) (PP (TO to) (BASENP (NNP Christmas)))))) (VP (MD will) (VP (VB cause) (NP (BASENP (JJ extreme) (NN disruption)) (PP (TO to) (BASENP (NNS deliveries)))))))) (PERIOD .))