Just a word of warning, the opportunities for contents insurance including cycles are NOT reducing BUT what is happening is that the companies are stripping cover out of home policies in an effort to get to the top of the screen scraper agglomerators like confused.com etc. If you are seeing cycle cover disappearing out or being factored down in your current policy, the chances are that there are other hidden changes that you may not have noticed, or your cover is not all you think it might be.
Along with this trend is the launch of "Premium" insurance products that mostly have cycle cover in. The more you delve into this and start comparing the detail, the more painful and confusing it will get. My advice is to assess each element of the risk you are insuring separately, take on voluntary excess if you can afford it, but be careful again, there is a point of diminishing returns reached quite quickly. Don't necessarily trust a call centre assistant if you are going off script (eg "What security do I need for my bikes?") And - if you can bear it - read the policy documents for the small print.