What was it called? Anyone seen it? It can't be as unfunny as Friends or Dharma and Greg anyway.
Update: I've found it. It was called Dogfood Dan and the Carmarthen Cowboy. It sounds utterly execrable. Did you watch it? I'd love to show you some, but apparently there are limits even to the rubbish Youtube hosts:
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Dogfood Dan and the Carmarthen Cowboy: Growing out of a single Yorkshire TV production in 1982 (screened in the series ITV Playhouse) and appearing as a one-series sitcom on the BBC six years later, Dogfood Dan And The Carmarthen Cowboy was a tale of two long-distance dogfood-carrying lorry drivers who, to the other's ignorance, are each having affairs with the other's wife. Although the men meet up on the road, exchange stories of their sexual escapades, and often talk to their wives about their travelling friend, the lies they spin and the false names they invent mean that neither the husbands nor the wives cotton on to the convoluted situation. Aubrey Owen likes to pass himself off as an MP, 'Aneurin', during his visits with Helen, while Dan claims he is carrying top secret 'abnormal' loads when pursuing the passionate Gwyneth. (Myfanwy in the 1982 version.) This was a complex, farcical idea from the ever-interesting David Nobbs, which employed sufficient detours and U-turns to make the extension from play to sitcom worthwhile.
So in its place, here's a highly appropriate clip from Porridge, the 1970s prison comedy.