There is no up-to-date reference. Michael Freeman's "The Bronze Coinage of Great Britain" is the most up-to-date book covering all halfpennies. There are some articles in some 2004 issues of Coin News (a British magazine) that covers more recent developments in the area of Victoria, but I think it's now missing at least three varieties.
No idea what the most up to date coverage of anything pre-1860 is though.
No idea what the most up to date coverage of anything pre-1860 is though.



















