hottowel,
Congratulations on your new job!
I worked for KLM uk/KLC uk/KLC for 5 years at various bases in the UK and in variuos roles including Cabin Crew. I really enjoyed those 5 years and I am sure you will enjoy your time with the company..
As far as I am aware (and I was there at the time) when the ABZ base closed NONE of the Cabin Crew were offered KLM 'Mainline'. The offer to relocate to another UK base was on the table and the company even toyed with the idea or having UK Crew based in AMS again but this never happened. We were always told that if you wanted to fly for KLM 'Mainline' you had to apply directly to them. This was the case in March when the ABZ finally closed anyway.
I really do hope they keep the remaining UK bases open as I still have a lot of friends at many of them.
Anyway, all the best. I hope you enjoy it as much as I did.
Rooster.