a well known bank seems untrustworthy.

I know id loose out on the intrest but I would like to move it if I can before this bank gets even more in trouble.

No. Once you have paid the maximum allowed in any year then that's it. You can take your money out but cannot put any in for that year Last year, as you say, is closed anyway!

You can put the new years allowance in and top up to ￡15k in July

Not sure if you are worrying about nothing, but you can usually transfer to a different provider. You need to check the terms that you signed up for.

a well known bank seems untrustworthy.

I know id loose out on the intrest but I would like to move it if I can before this bank gets even more in trouble.