Hi, I was wondering if you could help me with a couple of questions?

I live in the UK but the wine bottles I recycle from family and friends come from the world over, old world and new
world. Some are screw tops and some held corks.

My first question is: What cheap chemicals/products (preferrably readily available in the UK) are good at removing
label glue. About 50% come off with hot water and plenty of elbow grease. Others seem to resist my nails, chisel (!)
water and just about anything else. I've managed to get it off with a solvent cleaning spray I have but its very
expensive and not particularly efficient. I was thinking maybe petrol used carefully or something would be the optimum
cheap solvent. Any ideas?

The second question is has anyone had any problems corking screw top wine bottles? I have corked a dozen or so bottles
which were previously screw tops with no problems, but the neck glass seems to be thinner. I am using a portuguese
floor standing bottler with commercial corks which are a tad larger than some of the home bottling corks. I was
wondering if I should be wary?

Jim