As I understand it, the Thorn workshop is closed for now as Robin stated here:
http://thorncyclesforum.co.uk/index.php?topic=13751.0 On 23 March, this was posted to the St John Street Cycles Instagram account:
Our shop is now closed except for pre paid collections. Website is running as normal and no internal delays with shipping. Couriers are experiencing a high demand so some orders may be slightly slower.
The SJS Cycles website ( sjscycles.co.uk ) posted an update on 7 April to their homepage as follows...
COVID 19 Update
We are operating a mail order only service until further notice!
Please note: There are delays in delivery caused by the increased workload and reduced staff levels in all organisations thoughout the bicycle component supply chain and parcel courier sector. 07/04/2020.
As of 13 hours ago, their SJS Cycles Instagram account was offering Bromptons with local shipping at a reduced rate and for a limited time, asking folks to check them out online or to contact for spec changes.
Since there have been no substantial updates to their social media accounts since, I would expect things are continuing as noted above.
Best,
Dan.