enovi
Do you not have a Home Contents Insurance in the UK where you live? If you have, contact the Insurers and see if you can extend the cover Personal Belongings cover so that it covers the items for the lenght of trip.This is usually the best way, as normally Travel Insurances do not cover much in the way of personal effects.
You can enquire with Travel Insurers and see if they are willing to increase the level of cover for personal effects. This may be more expensive option if they are willing to do this.
There is also a company that provides cover for gadgets worldwide. Do a google for gadget cover and you will find them.
Huckster