Condition is absolutely everything. The coins you describe could range from a £1 or two (for their silver value) up to hundreds in perfect mint condition. For example, the 1845 groat is worth £10 in Fine (good condition with everything clear, but quite a lot of wear) up to £165 in Mint. The 1922 halfcrown, to pick another example, would range from scrap silver value in average condition, up to well over £100 in Mint condition. So you see, knowing the condition is vital. It would help if you could post a few pictures (you'll have to reduce the resolution to 150k which is the limit per post here, or else upload them to Image Shack or Omnicoins or some other suitable picture hosting site, and post the links here). I'll try and add a few pictures to show you what the main condition grades are like.