The Home Office Guide on Firearms Law makes the following statement on component parts -
13.70
The term “component part” may be
held to include (i) the barrel, chamber,
cylinder, (ii) frame, body or receiver, (iii)
breech, block, bolt or other mechanism for
containing the charge at the rear of the
chamber (iv), any other part of the firearm
upon which the pressure caused by firing the
weapon impinges directly. Magazines, sights
and furniture are not considered component
parts. The 9th Report of the Firearms
Consultative Committee provides additional
information on this subject.
I would suggest that your component is one that would not fall into the category of a certifiable component.
You may wish to contact this company for a replacement -
http://www.wallarms.com/
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