Both hold some British products and the Intermarche is open all year round. Go through the sliding doors walk forward 4 metres (past the first isle) turn left walk forward 4 metres and on the right you can find international products.
There's an aldi in vila seca and lidl in cambrils and in Tarragona
There is a Mercadonna in salou near the railway crossing and many in Tarragona.
The Hypermarkets Carrefour in Tarragona and Reus have small section which sometimes carry things like Bisto.