I only know of two UK companies who make that easy to do, NFU Mutual and Hiscox. The excess for my names items was much, much higher than the straight quote with standard personal items covered. Can you advise me please who you use?
There are a few dedicated camera insurance companies who do short term holiday insurance and I have used one once only. Even the 30 days cover ranges from £33 - £105 and the excesses are between £100 and £150.
Of course all depends on folks experiences, as one never knows how good they are until it comes to a claim.