I'm just getting into the details of phonics, and the phases that different sounds and letters fit into, but here are a few games that may be on help.
Letters and Sounds.
This seems to be the main government training resource
Details on Phases, as well as games and resources:
Choose the individual phoneme to work on.. Probably phase 4-5
Great for finding two letter phonemes - make words using two 2-letter phonemes
Really enjoyed this one - avoid the flying rocks
Family Learning Phonics games
A fantastic collection of phonics games
BBC games collection
A wider selection of games can be found: