Hi,
Could someone advice me on the above question please?

Thanks

Hi, I am on my tier 1 (general) visa and will be applying for my ILR very soon. I had been to the US for about 2 weeks for a conference with my employer, Could you please let me know if I need to produce a letter for this absence as I am not sure if this rule applies for Tier1 (general) visas. Thank...