My neighbour also had their rather expensive bike stolen from their shed on Vancouver Road a few months back.

I think it's unfortunately the way things are for the opportunist thief.

If you have a side garden entrance make sure it can be locked and also affix a trellis or high panel above to make hopping over or passing a bike over the top more of a challenge.

Also the floor anchor thing in cement mentioned above with a good quality D lock should prove too much for an opportunistic thief.