Well, good news indeed, but I can't find info about this.
All I can find, thus far, is word that he'll be back this year, 
riding a Melbray Manx & possibly riding in the Junior too.

Story as told on Facecloth, Manx Grand Prix Support Group , run by Carolynn Sells.
Glen English ex classic bike world champion and ex MGP classic senior winner makes a welcome return to the mountain course on the Melbray London 500 Manx Norton and 350 Honda at this years classic MGP.

https://www.facebook.com/photo/?fbid=102...6963735231

I've just read that 2000 was the last time Glen competed, that sounds incredible!
What, with Hutchy coming back too, after such a long break, it really is going to be a Classic!
Anyone else, maybe next year? , I wonder?