Games : How can I deal with early pressure as the British in AoE3 vanilla? [on hold]

I'm struggling when I'm under early pressure. I do get my economy up and running quite nicely. If I get past the 11-12 minutes there is no problem (yet^^). But withstanding the first agression seems hard to me. At what time do you start building barracks (I guess building units from the barracks is the most effective defense)?

Normally, I age at 17 villagers and start producing my first barracks units at around 9:00.