due to stupid extension i’m losing my garage and its being replaced with a much much smaller workshop area, so my bikes and the mrs commuter will need to be housed in the garden, alongside lawnmower,tools, kids toys/bikes etc etc

any ideas/suggestions?

Depends on the value of your bikes and how much space you need. As a minimum I’d get a sturdy shed, reinforce the door and lock bolts, then chicken-wire the interior to beef up the security. Either fit a ground anchor into a concrete foundation under the shed (ideally before building the shed) or get yourself a shed shackle afterwards.

There’s only so much you can do to secure a wooden shed, more heavy duty metal sheds out there too but can be expensive.

HTH

keep much-loved bikes an precious stuff in the new extension, install boring new kitchen in shed.
😀

Depending on budget? These look a good secure means of storage.

http://www.asgardsss.co.uk/

loving the asgard stuff, cheers.