Tony, I had exactly the same problem with my previous 1100s. It got so frustrating bleeding it all the time and I eventually bit the bullet and replaced the master cylinder on the handlebars, it sorted it straight away and stayed perfect until it was sold.
My guess is you have the same problem. There wasn't a seal kit available back then (4 years ago), possibly there may be now if enough have failed?
I bought an Oberon slave cylinder, replaced the hose and fluid numerous times before realising and finally sorting it!
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