Thanks for your pictures!
I also find it not so easy to get in contact with the Swift Club!!
But they have my subscription and I expect news shortly.
I believe the site/club is run by volunteers, so patience is required.

Your bicycle pre-dates mine because it has the front forks with the indentation along them.
This is an important distinction with Swifts, I have learned.
Do not know when the change occurred though.

Also your chain-wheel seems to have a heavier/thicker construction to mine.
Same logo/pattern though.
I will ask the curator at the Coventry Transport Museum tomorrow for more information
re your pics. Have you tried to contact them?

http://www.transport-museum.com/swiftcentre/index.aspx

If you email them address your message to lesley.robertson@transport-museum.co.uk
She is the bicycle curator and very helpful.
She will be very interested to see your pictures.