'Back in the Day', I thought that a 'Spec Rec' normally implied that one should be promoted at the next available opportunity....
Clearly not though - it took me 3 consecutive SRs before I was promoted to Sqn Ldr Spec Aircrew - once described to me as 'the best rank in the air force'!
The RAF has always seemed to be geared more towards looking after the 'chiefs' rather than the 'indians'.