We occasionally get a blockage and call out Wessex Water. Although the blockage is our responsibility, I at least know (a) they will do a proper job, and (b) what the charge will be.
Chatting to the operative last time he suspected the cause may have been a slight subsidence of one pipe (~25mm confirmed by camera) which does not fully drain exacerbated by low flow - we spend a large part of the winter in Spain so any deposits solidify and build up.
His suggestion - fill wheelbarrow with as much water as it will hold. Deposit in upstream drain cover. The pressure created by the pressurised flow of a large volume of water should flush the pipes in a way that a running tap has no chance.
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