To the Editor: Regarding "My London, and Welcome to It" (April 29): One of my fondest memories of London includes the daring businessmen, carrying their briefcases, dashing out before oncoming traffic comes around the corner at what seems like incredibly high speeds. They usually make it, but I am never willing to follow them. One great tip: fly into and out of Gatwick. It's easy to navigate, and has a direct connection to Victoria Station. Molly Robertson, Taos, N.M. To the Editor: Sigh. London was my first real boyfriend. And a good one. Lauren Oliver Santa Fe, N.M. To the Editor: As an ex-Londoner born and bred many moons ago, I can't help noticing that most of the glowing comments about it come from non-natives. How are they to know how much it has changed in the last couple of decades? A. A. Gill has accurately described its superficial appeal to visitors, but the quality of life for residents in many areas has deteriorated so drastically in recent years that many indigenous Londoners have uprooted themselves and moved out. The vacuum is being filled by a continuous influx of newcomers from around the globe. Valerie Lehmans Seattle