Try here - else there is 'Advanced Search' on this forum which shows this has been discussed multiple times.
http://forum.tz-uk.com/showthread.ph...=1#post3376998
https://forum.tz-uk.com/showthread.p...with-insurance
https://parcel.dhl.co.uk/what-you-can-and-cant-send/ - DHL watches up to £4K