of an adaptor 120 220 arranged not to form an electrical connection to the receiver does not make contact to the contact pad 382 thus in adaptors that are arranged to make electrical connection the axial conductor 333 may be arranged to project a greater distance beyond the cross pin 324 than the shaft 322 of an adaptor of a non powered accessory such that electrical connection may be made to the contact pad 362 if is to be understood that other designs of adaptor are useful in addition to those described above for example other latch arrangements are also useful including latches of the spring loaded bearing type it is to be understood that receivers and adaptors according to embodiments of the present invention by means of which electrical power is supplied to an accessory comprising the adaptor may be deployed in a range of applications including cargo bays of vans trucks transport containers buildings aircraft and marine vessels embodiments of the invention may also be useful in other applications throughout the description and claims of this specification the words u201c comprise u201d and u201c contain u201d and variations of the words for example u201c comprising u201d and u201c comprises u201d means u201c including but not limited to u201d and is not intended to and does not exclude other moieties additives components integers or steps throughout the description and claims of this specification the singular encompasses the plural unless the context otherwise requires in particular where the indefinite article is used the specification is to be understood as contemplating plurality as well as singularity unless the context requires otherwise features.