The Robbe factory was sold off probably with most of the moulds and equipment when the company got into difficulties.
There are some kits available and Cornwall Model Boats stock the available range. I would check the Krick site for their postal charges to the UK.
The demise of Robbe and Graupner was a big set back for model makers universally and its a pity many of the resources were lost before a rescue was possible.
I agree with Doug E-Bay does have them listed occasionally and I have seen them at Model Boat Shows bring and buy sales.
CADMA is possibly the next show (2nd - 3rd Jun), the Mutual Model Boat club appears to have moved to September not forgetting The Model Boat Convention on 25th - 26th August.

thank you for that info love these boats second one on the build at the moment found that on fleabay lol
😁

Hi fryer
Krick Modelltechnik bought out Robbe and rebranded their boat stuff as 'roMarin' - "The ship model division of Robbe Modellsport has been owned by Krick Modelltechnik since summer 2015. The former Robbe products will be marketed from 2016 under the brand "romarin by krick"."

Düsseldorf (or Duesseldorf!) currently listed as 'Not in stock/Currently not available', 'Delivery time: On request'.
€249 approx 200quid + shipping.
http://www.krickshop.de/Products/RC-Models/RC-Shipmodels/Duesseldorf-Fire-Fighting-Boat-Kit.htm?shop=krick_e&a=article&ProdNr=ro1100&p=73

You might find one on Fleabay in the meantime.
Krick
Viel Spaß damit, 😎Doug