GLA will become an E195 base...its all rather confusing and keeps changing but the first E175 will go to GLA until September. This then swaps with the current INV based E195. The second E175 goes to Manchester to operate as you have posted plus some others such as JER and any W patterns from there to the likes of DSA.
Not sure where the third will go yet, possibly another MAN but more likely to be BHX or SOU.