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Exterior:
Astra J dipped beam headlight bulb: 55W H7 (477)
Astra J main beam headlight bulb: 55W H7 (477)
Astra J sidelight and DRL bulb combined: W21/5W (580) (also called 7443)
Astra J AFL cornering bulb: H11 55W
Astra J front fog light bulb (MY10-MY12): H10-45W 
Astra J front fog light bulb (facelift MY13-): H11 55W
Astra J front indicator bulb: PSY24W (amber)
Astra J side repeater bulb: W5WY (501A) (amber)
Astra J rear indicator bulb: W16W (955 - but note that Halfords' 955 is 21w)
Astra J tail light bulb: W5W (501) (6 tail light bulbs in total)
Astra J number plate bulb: W5W (501) (two are used)
Astra J brake light bulb: W16W (955)
Astra J reverse light bulb: H21W (435) (off-set pins) 
Astra J rear fog light bulb: H21W (435) (off-set pins)

Interior:
Astra J front courtesy light bulb: W5W (501)
Astra J front map reading lights: W5W (501)
Astra J rear courtesy lights: W5W (501)
Astra J glove box light: W5W (501)
Astra J vanity mirror lights: 6615F 
Astra J boot luggage compartment light: W5W (501)
Dash/centre console/instrument panel: TBC

GTC:
Astra GTC headlight bulb: 9012 (55W single filament provides both dipped and main beam)
Astra GTC sidelight and DRL bulb combined: W21/5W (580) (also called 7443) 
Astra GTC front indicator bulb: 581 (amber with offset pins - silver chromed versions available)
Astra GTC side repeater bulb: W5W (501) (clear glass - amber colour is in the lens)
Astra GTC front fog light bulb: H10-45W (Sylvania 9145 42W) PY20d base INFO
Astra GTC brake and tail light bulb (outer): P21/5W (except with LED tail lamps)
Astra GTC rear indicator bulb: WY21W
Astra GTC reverse bulb: W16W
Astra GTC tail light bulb (inner, on tailgate): W5W (501) (except with LED tail lamps)
Astra GTC rear fog light bulb: PSX24W
Astra GTC number plate bulb: as per 5-door Astra J above.
Everything else TBC.


Notes regarding "CAN-bus" and LEDs
Most exterior bulbs on the Astra J and GTC are monitored by bulb-check circuits that report failed bulbs to the on board computer via the CAN-bus. If you replace these bulbs with LEDs or HIDs, the resistance of the bulb and the current it draws is different from a normal filament bulb, so the car reports a bulb failure. There are many so-called "CAN-bus compatible" bulbs on the market, but the Astra's bulb check circuits are very sensitive so most of these still result in an error message. Your alternatives are:
1) Use ballasts / load resistors that mimic the load of the original bulb more closely
2) Stick with filament bulbs (there are premium and whiter/bluer options available)
3) Install what you like (just don't overload the circuit) and ignore the error messages (they cause no harm - just annoyance!)
Interior bulbs are not monitored by bulb-check circuits. However, the dimming circuits which provide the fade-up/fade-down lighting effects do need a complete circuit path to drain current. If you install all LEDs you may find the lights do not fully go out. Using at least one so-called "CAN-bus ready" LED in each circuit solves this problem because the built-in load resistor provides a path for the current to drain.