I left my car for 1 day outside my house, next day I went to drive off but the car just didnt move, anyway 5 minutes of putting it in first and reverse the backwheel finally banged and the handbrake was free.

Anyone else had this? I had a quick google before posting and I found something along the lines of if its kept in a garage condensation can form in the break and cause it to rust (I bought the car few days earlier from someone who kept it in a garage)

As of right now the cars in my backgarden without the handbrake on in 1st gear.

Also I might be being a bit paranoid but the handbrake doesn't feel "firm" it seems loose and slightly wobbly but works fine(apart from it seizing) a few handbrake stops proved that

Mine often does this if I don't use the car for a weekend, perfectly normal for it to seize slightly until you put a bit more throttle on.

The handbrake's really easy to adjust from inside the car. Follow the steps detailed here. Make sure that when tightened you can still get around 6 clicks of movement, you don't want to overtighten it!

Im taking it you have drums on the back?
I had a similar problem with my handbrake sticking on one wheel. Turned out the rubber from one of the drum pads had seized on the drum and torr-en off. So every time I placed it into reverse the rubber would jam itself between the pad and the drum locking the wheel. Hopefully your problem wont be so bad, but at worse your possibly talking at stripping the brakes and checking the pad condition

Our does that too on damp weekends. If laid-up, the next time you try to set off, the shoes will have stuck themselves to the inside of the drums. That said, it doesn't require much throttle to break them free. Just set of as normal and there's sometimes a bit of a jolt as they release.

P.S. I always thought it was bad practice to adjust the handbrake at the cable? It's better to SLACKEN the cable fully, and then adjust each side in the brake drum as much as possible (shouldn't be necessary because they are supposed to self-adjust but the adjusters seize) and ONLY THEN should you take up the slack on the handbrake cable. Otherwise, the leverage is all wrong and the handbrake won't be as effective as it ought to be.