Well, looking at this we have 24 patrol boats, so assuming that we have 2/3rds of those operational would give us 16, which if we assume a six hour patrol time per boat gives us the 4 that the article talks about, for the whole of the UK. So we could plonk all of those in the Channel, but this I think is rather missing the point that the Navy would simply bring the people in dinghy's back to the (UK) shore.
Well, looking at this we have 24 patrol boats, so assuming that we have 2/3rds of those operational would give us 16, which if we assume a six hour patrol time per boat gives us the 4 that the article talks about, for the whole of the UK. So we could plonk all of those in the Channel, but this I think is rather missing the point that the Navy would simply bring the people in dinghy's back to the (UK) shore.