Switched from a Tier-2 Intracompany Transfer to an FLR(m) visa on 13 September 2018 kicking off my 5-year clock for settlement.
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This forum has been incredibly helpful for me since my initial visa back in 2011.
Congratulations.
My initial thought was what about ILR on the 10 year Long Residence, but from your dates it seems you had more than a six month gap outside the UK since 2011?
The UK closed the 5 years route to settlement on the Tier 2(ICT) visa at the beginning of April 2010.
Those who applied for that visa between 5th(?) April 2010 and 4th(?) April 2011, were allowed to get ILR on this visa after 10 years in the UK, but they had to remain with that same ICT visa sponsor for 10 years.
For applicants from April 2011 there was no way to get ILR on a Tier 2 (ICT) visa even though the UK had raised the requirements to be able to get this visa.
If you left the UK with a valid visa and returned within 6 months with a different valid visa, then your continuous stay for ILR after10 years (LR) wasn’t broken.
I assume you know that those married to a British Citizen can apply to naturalise as British Citizen as soon as they are granted ILR and meet the other requirements?