If you want to train in an Aikido style and club where you can do competitive randori (i.e. sparring, although I hate that word)
and receive more explanation during and after your training, I would recommend you contact Martin Livingston:
Martin is a very experienced martial artist with a lot of cross training experience.
Shodokan aikido has a lot in common with Judo and I'm sure you would find both the atmosphere and techniques easy to adapt to.
Good luck finding the answers to your questions.
Dojo Address & Practise Times
The Centre for Sports & Exercise Tuesday 20:15 - 21:15
Heriot-Watt University Sunday 13:15 - 15:15