Is Labour Starting To Abolish Democracy...
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No best answer has yet been selected by electricblue. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.'Col di Valmonte' is an Italian vinyard from Venietian region. Couple of online places to buy their sparkiling wine if you google it, but this is not 'champagne' nor a 'veuve' house.
There are over 12000 wine growers that offer grapes to champagne makers. Most are non vintage (NV) and as the Porthavallen site states their wine is a NV, likely that they have a sole importer that offers them the label from that house. As above, best would be to call the hotel or the pub you know and ask the name of the importer. One link to a few of the houses here: http://www.champagnemagic.com/houses.htm for an idea of the range. Just because they are not on the web by the way doesn't mean they aren't available.
Other possibility is the owners of both places were on a visit to Rheims or the Champagne region and chanced on the same House and ordered the same wines for their restaurants, and they aren't actually imported in quantites to make it worthwhile for an importer to stock.