One Hour/Same Day Dry Cleaner in BR?

Most don’t advertise but call them and depending on what you need done they will probably do it for you

I'm pretty sure both Welsh's and Kean's offer same-day service if you drop the item off by a certain time (like 8 or 9 am); usually ready after 4 or 5 in the afternoon, but check and make sure before you drop off. Also check their closing time to be sure you can make it there after work before they close.