Many thanks for all your comments and they were extremely helpful. In particular, I would like to thank Michael Knight who pointed me towards my nationwide flex plus account which gives me 120 days comprehensive insurance at a cost of about £400. If I stay longer I can use the Safety Wing essential nomad insurance on a pay as you go basis at a cost of about £130 a month. The SafetyWing policy is one of the very few that you can take out when you are already abroad travelling once again many thanks to everyone.