Hi PinCushion,
you can definitely fly on a NPPL and be able to carry passengers with you. Since November last year, type 1 diabetics can obtain a DVLA group 2 classification. THere are some criteria to be met. Generally speaking, if your diabetes is well controlled you won't have any problems in qualifying for group 2.
There is rumour (and hope) that the LAPL medical requirement may somehow change and preserve the existing rights of type 1 diabetics in the UK. But this is pure speculation.
However, you will be able to fly SSEA on a NPPL until 8th of April 2015.
If you want to know more, send me a PM.
Cheers!