Thai customes website states that allowed to import duty free 1 litre of spirits - no mention made of wine:
>> Thai Customs <<
Reckon 10 bottles maybe questionable however. As stated in earlier post TanMan champagne is imported - all imported spirits carry higher duty than domestically produced products - thats why Champagne, Guiness, Corona etc are more expensive here than Europe/US/Oz.
Tesco Lotus does have a booze shop in the front (opposite the checkouts) but selection not extensive. Think you'll be better off in TOPS (Central).