They are saying twenty quid, which is slang for 20 pounds sterling (the currency called GBP). It's worth about 30 bucks (USD).
A 'doddle' in British slang means something is easy. For example: 'that essay was a doddle!'.
'Let's gave a do' is a British expression meaning 'let's have a party!' For example: 'You're engaged? Let's have a do to celebrate!'
Bladdered is one of the many British slang words that means 'drunk'. For example: 'Look at Jake, he's absolutely bladdered!'
'Brassed off' is British slang meaning 'fed up'. For example: 'I am really brassed off with all this homework!'
If someone says that they validate you as a person, they mean that they consider you to be a worthwhile person.
Quit talking, listen to what she says. YOU DO NOT HAVE TO AGREE, but a person can not argue by themsleves
Usually to "quit somebody" means to give up on them. So, when someone says they "quit you", that means they are done trying to help you or convince you of something.
You mean 'C of E'. This is commonly used to refer to the Church of England. For example: 'The C of E is bankrupt again'.
This is a friendly gesture. It means 'good luck'. It is usually followed by the raising of drinking glasses or tea mugs in salute to the person receiving the good luck. For example: 'Doing your exams? Well then the best of British to you lass!'
This probably isn't what you think it is. A cock up in British slang means 'a mistake'. For example: 'I made a total cock up of that pie!'
'That's beastly' in British slang means something or someone is nasty or unpleasant. For example: 'Shaun is a rather beastly fellow!' or 'that smells incredibly beastly!'
what does it mean when the mortgage company says they must read the underlying of the mortgage? I do not quit understand what that means.