As title really, spotted a poster outside my local "National Tyres and Auto Care" (they're a national brand) saying they did oil changes using Castrol oil.
So I popped in, gave my reg and the guy said it'd be £43 for oil and filter change , including labour. The oil would be Castrol Edge 5w-40.
So, any reason why I shouldn't? It's cheaper than I can buy the oil for!