How to trade options for UK Stocks

Hi guys/girls

I live in the uk but trade options on USA stocks and have done for a little while.

I have a brokers account with interactive brokers for my options trading.

First question : are these a good brokers to use for uk stock options??? who do you use.

Second question. For US stocks 1 contract represents 100 shares of the underlying.
when I use Interactive brokers to get a price for say Glaxosmithklyne I have to change the exchange to ICEEU.

does 1 put contract represent 100 shares of gsk through ICEEU? the details Interactive brokers give say the multiplyer is 1014.

thanks in advance

How to trade options for UK Stocks