As Leigh said they do multi bike .I have my 2005 R6 and both my 18's on the same policy with them and I added Stephens Blade for a few hours when I used it a few weeks ago and that only bummped the cost up by £14 for the year so it was about 1p for the 3 hours I had it insured

For every 8 month's your insured with them you get a years no claims discount,you can down grade your policy so it just covers it being in the garage when its off the road.