https://www.thule.com/en-gb/gb/bike-rack/towbar-bike-racks/thule-rideon-9503-_-9503
that's the one i used to have, sturdy, but heavy and bulky, and due to how the door opens on the disco dont think you can get in to boot without bike removal
something like this http://www.chainreactioncycles.com/mont-blanc-4x4-cross-spare-wheel-bike-carrier/rp-prod40974
still allows use of rear door easily
i did not have it on a disco unfortunatly only had a renaxxxx at the time, there is an adapter for the thule velo compact
https://www.thule.com/en-gb/gb/bike-rack/towbar-bike-racks/thule-velocompact-927-_-927
+ http://www.halfords.com/motoring/roof-bars-roof-boxes/roof-bars-fittings/thule-9241-velocompact-spare-wheel-adapter?cm_mmc=Google+PLA-_-Roof+Bars+and+Roof+Boxes-_-Roof+Bars+&+Fittings-_-156087&_$ja=tsid:60494|cgn:GoogleShopping|kw:156087&istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istItemId=rqaiwpilm&istBid=tzxa&_$ja=tsid:35522|cid:344535124|agid:24345233764|tid:aud-80976662749la-211149457444|crid:97376479204|nw:g|rnd:6888625031241923678|dvc:c|adp:1o1&gclid=Cj0KEQjwo-XIBRCOycL7hsuI_NoBEiQAuS6HtLFXbttIyKwjVvY8VXWxTe62QivEi4oscqSil_BhMMAaAtDC8P8HAQ
but it's not cheap
The same one we have on our disco. I have a lighter one for my dacia made by mont blanc that locks on with a scissor action.There's a few threads already in the Forum, this link has my contribution on the subject. https://www.landyzone.co.uk/land-rover/bike-carrier.282037/#post-3472093
Sent from my iPad Air on a train.