1) can i get any tax relief on the shares i forfeited and offset same against the shares i sold?
What do you mean "forfeited" ?
2) the shares i sold now were about 20pence below market due to lack of liquidity etc. is this considered in any shape or form a loss? and does it affect my CGT liability?
Not a loss; you sold for the price you received.
also was wondering - these were shares i got as part payment for the company so although i didnt pay for them there was a nominal value at that time as the company that bought us was stock listed.
Now i have sold at below that value so does that impy a loss and hence no cgt?
The shares issued to you in the acquiring company would take on a base cost which was determined by the original base cost of the shares which the company acquired (in essence any gain you made at that time was probably "rolled-over").