I ordered a standing desk 
The one I linked to above:
https://www.amazon.co.uk/AIMEZO-Electric-Adjustable-Standing-Workstation/dp/B07CXMCFP5
On looking at it again they replaced the faulty motor that was mentioned in the review and the lower price I saw mentioned was actually relating to the smaller version. It has a 5 year warranty so I’m happy to give it a go. It can also take a desk/table top of up to 200cm which is great (though for now in this room I just want to use my existing top). It also goes higher than others I have seen (129cm) which means I should be able to fit my exercise bike under it 
Longer term, I think I am going to order a standing desk treadmill (I’ll start a thread for those now!)