The methods of the disclosure may enable large numbers of apparatus 21 to be produced at low costs. The method may be fast as processes such as curing may only take several seconds to be completed. The method may avoid the use of high temperatures which could damage sensitive components. For instance the thermosetting resins may be set at temperatures of 200° C. which may be low enough to avoid damaging other components of the apparatus 21.

In the above description the term “coupled” means operationally coupled. Any number of intervening components may be provided including no intervening components.

The term “comprise” is used in this document with an inclusive not an exclusive meaning. That is any reference to X comprising Y indicates that X may comprise only one Y or may comprise more than one Y. If it is intended to use “comprise” with an exclusive meaning then it will be made clear in the context by referring to “comprising only one . . . ” or by using “consisting”.