Am trying to identify source of oil leak from these pics

[DaveJones12]

Hi there

I have an oil leak on the right hand side of the engine, as the enclosed pics show, seems to be coming the housing under the red clip in the 2nd image.  I would be grateful for any comments/suggestions.  

[Vauxhall Owners Club]

I think you may be able to view it better from underneath but certainly needs removing to repair or replace with this much oil leaking out

[Kevin Armitage]

I have the same problem mine through all off my oil out last Sunday washed off engine refilled oil with oil additive been in to garage for two days thay said can't find leek now just came home from work and now seeking again any one have any idea what it is before I strip down