Uniface Lead Token with bird & bush (Bought in the UK)

Seems like lead, but could be tin or pewter? 4.6g (0.16 oz) and around 2 cm (4/5") in diameter. The rim slopes in slightly towards the picture side/face.
Any information would be well appreciated. Thanks.

A lead token, like these, also from United Kingdom ...
https://en.numista.com/catalogue/index.php?e=united-kingdom&r=&ct=exonumia&im1=&im2=&ttat=y&ttcw=y&ttde=y&ttdt=y&ttga=y&ttlo=y&ttte=y&ttpa=y&ttph=y&ttri=y&tttr=y&ttin=y&ttle=y&ttmi=y&ttsc=y&ttwc=y&ttsf=y&ttfe=y&ttfr=y&ttfu=y&ttut=y&ttbu=y&ttco=y&ttlt=y&ttta=y&ttwa=y&ttre=y&ttba=y&ttbr=y&ttca=y&ttcu=y&ttia=y&ttma=y&ttna=y&ttsa=y&ttua=y&ttxa=y&ttam=y&ttcm=y&ttem=y&tthm=y&ttim=y&ttsm=y&ttmm=y&ttpm=y&ttrm=y&ttxm=y&ttym=y&ttad=y&ttct=y&ttme=y&ttar=y&ttts=y&ttcs=y&ttes=y&ttrp=y&ttbl=y&ttbb=y&ttmt=y&ttpt=y&ttcf=y&utility_items=y&ttwe=y&ttfc=y&ttpe=y&ttfp=y&ttpl=y&tpat=y&tpcc=y&tpfa=y&tppa=y&tpre=y&tpso=y&tpco=y&tpfx=y&tppo=y&tppr=y&tppc=y&tprc=y&tptv=y&ttpr=y&ttot=y&tpop=y&cat=y&ru=&ca=6&no=&v=&i=&b=&d=&u=&a=&dg=&m=21&f=&t=18-22&w=&mt=&g=&se=&c=&wi=&sw=
Those are wage tokens. Maybe it is a hop token, mainly used in Kent.
There are some more (with information) on this page, under 'Lead Tokens' section ...
https://www.thetokensociety.org.uk/

Thanks for your thoughtful, detailed and helpful resonse. This confirms that I've been thinking along the right lines and gives me some useful new links to specialist resources. I even saw a token in the link with a central raised point (presumably where it was attached after casting). In that coin, it formed part of the geometric pattern: in mine it's an unwelcome imposition in the picture. Does the bird and bush mean anything or suggest an issuer? Thanks