The shilling coins (and all new pence coins from then, i.e., 1/2p, 5p, 10p & 50p except the 1 & 2p coins) are obsolete but the banks may exchange them for new ones. Of course there may be some collector value (the shilling + higher coins contained silver if minted before a certain date).

The 1 shilling coin was worth 5 new pence (the new 5p coin is about the size of a dime)

The 2 shilling coin was worth 10p (new coin is about the size of a quarter.)

The only other coin might a 6 old pence (2 1/2 new pence) piece which is a collector item.