Hi- You are more than welcome to train with us at the Budokwai in Gilston Road in Chelsea see www.thebudokwai.com
Training is Monday at 7:30 pm to 9:30pm pm and this concentrates on tai jitsu (albeit we do some tanto and kenju from time to time) and Friday 8:00 pm to 10:00 pm which is split between tai jitsu and weapon work (bokken and jo).
The class is run by John Cornish whom trained at the Hombu dojo from 1958-1964 (and made numerous visits back) and was in the same cohort as Chiba Sensei. He also trained at the Kodokan at the same time (under Mifune Sensei amongst others and partnered Donn Draeger).
It is a friendly atmosphere and we have various visiting aikidoka from different organizations including aikikai.
Hopefully see you on the mat!