Turning right but can't see cars coming (UK) I'm a newbie to cycling and I was wondering if I done the right thing or I should do something different next time.
I'm coming down towards a main road where I can either go left or right. I want to go right. Both sides are packed with parked cars. I can see there's no cars coming to the left of me but can't see to the right of me. I couldn't hear a car coming up either. I look left and decide to slowly roll out while standing up on pedals. As I'm rolling out I'm looking right and then see a car coming at me (electric taxi). Not really close but still I thought I better get across quickly just to avoid any incident, so I pedal across and feel car come quickly past me.
I should normally hear cars but I didn't this time. I didn't really enjoy not 100% knowing a car was coming up the road and having to quickly pedal across. Did I do the right thing by slowly rolling/edging out?
Sorry for newbie question just wondering if I should have maybe got off bike and looked on foot or something.
It's not easy.  A few factors make it harder.

The double yellow lines don't extend vary far up Chipperfield Road (for those not in the UK, they mean &quot;no parking&quot;).
Cars can come up too quickly for the conditions, and taxi drivers are notoriously impatient, as well as likely to pass too close without slowing down.  Seeing a hazard rolling out of the junction the driver should have slowed and prepared to stop even if you were being stupid (which you weren't).
Electric cars at urban speeds can be very quiet, easily drowned out by general traffic noise from further away.  Like you I use my ears a lot when riding.
In the dark, modern streetlights remove a cue I used to use - the reflection of white headlights on the road lit by orange lights was the first sign of cars at one junction I ride regularly.

That said there are a few things you can do.

First you need to be aware of your lines of sight, and when they will open up.  So as you roll forwards, you need to be looking right when you can see past the parked cars.  And not just past but through and over them.
Look for vehicles coming from the left further away.  If the road is only wide enough for one car, have they stopped to let someone through?
You may need to stop suddenly, put your feet down, and take a step back.
Eventually though, you may be committed to going - do so decisively.  Pedalling hard for a couple of seconds doesn't just accelerate you, it signals that you're definitely moving.

Standing up on the pedals raises your head (only a little because you've got to hold the bars), helping you see and maybe even be seen, but you'll probably roll a little further before you can put your foot down.  I'd stay seated, unclipped from the pedals, but I'm tall and choose pedals that I can clip to but can ride gently without clipping in.
The problem with getting off is that by the time you get back on things have changed.  The only thing to do then is cross on foot and rejoin.  That shouldn't be necessary here, but it's always a valid option