Most definately worth getting bike insurance, unless you are so loaded that if it got nicked you could easily afford to buy another one (with cash). Otherwise I would get insurance. I have M&S and lots of other people here will suggest M&S and Big Pete says up to £4000 and you don’t have to specific. A lot of insurers will only insure items up to £1500 and if you want to list specific items they charge more. I would ring around, don’t bother on internet as you can’t ask all the specific relevant questions about the bikes, as again price will very a lot depending on where you live, also are you in multi occ or have your own house? Again that will effect prices.