Straight Ahead off 09 at EGGP is just about the most dangerous thing you can do for reasons given above ie Traffic everywhere!!
If you can get some control after the failure , I suggest you turn left 30 degrees on to 060.
This won't provide standard separation but it increases the chances of missing most of the traffic.
On runway 06L/R at EGCC , you'll still be head-on to traffic working Manch Approach descending to 3500ft but ,hey, who said flying's safe.
They are allowed to be at 3500 ft just east of the LPL while you're climbing to 4000ft on your 09 SID.
Safety Cases you've got to love them.
Get that 7700 squawk on as a priority - before RT calls.