The Verine Ballade is now discontinued and Verine have been purchased with their products now modified it will be unlikely that you will be able to find a suitable spare part. Which ever part they are offering it is probable that it would not fit. I used to work with verine many years ago and am familiar with the products. I'm afraid it looks like the easiest and safest option will be to buy a new model, the most suitable will be the updated version of the ballade which is now the alpena. I buy all of my fires from www.fireplacemegastore.co.uk (now being a gas fitter, I've certainly done my research to find the cheapest) You will be looking at around £600 for the fire then around £200 to fit.
good luck
Steve Smithson, December 2009