Few of my mates on a local forum were always asking this very question after passing their tests. Within a couple of weeks every one of them found work.
Key is to keep looking and you’ll eventually get lucky. Also no one i know had any luck what so ever with agencies.
Reed Boardall as said will take you on, bad money and long hours though… top kit though.
i’ve managed to get a start with symphony 
Davey P:
i’ve managed to get a start with symphony
What instrument will you be playing ? … 
sorry, I thought you said ‘a symphony’ (as in orchestra)
Seriously, WELL DONE 
Are there any fiddles?
Davey P:
i’ve managed to get a start with symphony
Ahhh as a newbie, its like music to my ears to hear fellow noobs getting jobs!! Sorry couldnt resist!!
Many congratulations mate!