I think the best bet is likely to be the CTC/CityBond policy.
Snowcard will only insure for up to 60 days. But if you can live with that limitation they have the option of getting up to £2000 cover for activity equipment. So might be worth checking out.
CTC/City Bond single trip insurance seems to cover for more than 60 days (I tried getting an online quote for 62 days). (But note that if you take out the annual insurance policy the maximum trip is 50 days).
I don't think house/flat contents insurance is an option: IIRC if I'm away from home for more than 30 days my cover lapses (but I could be wrong).
The other potential option is insuring the bike against theft/damage, but looking at Cycleguard just as an example, the individual trip limit is 30 days. Also the premiums for this type of insurance are about 10 per cent of the value of the bike per year.
As far as the question of is it worth it is concerned, at the end of the day it's got to be a personal decision, but you might want to consider:
- your EHIC card will go a lot of the way towards covering the costs of your care (but remember we are treated on the same basis as the locals - so if they have to pay, or pay upfront, then so do we);
- on the other hand EHIC won't cover all of the other costs that might be associated with getting sick or injured - eg the costs of getting you and your bike back home;
- the other major issue is theft. How much of a blow this will be to you obviously depends on the value of the bike. Clearly if you've got a £500 bike then insurance may not be as important as it would be if you have an expensive one.
Oh and finally, if you go down the CTC/CityBond route, be aware that if you leave your bike unattended then it has to be locked to an immovable object with an approved lock. For bikes that are worth between £500 and £1000 that is a lock rated silver or better by Sold Secure.