you might need to look into it, but if you've booked your tickets with a credit card then some of the banks will actually include travel insurance for the trip.
there's a few english companies
www.journeywise.co.uk
www.atlasdirect.net
www.insureandgo.com
www.direct-travel.co.uk
best is probably
www.planet-travel.uk.com
or
www.trailfinders.ie
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