for a saffa in london, where the best places to go for a weekend trip? and which don't require a visa?

Question

what good travel companies can i contact

Answer 1

There are so many travel companies that unless you work for one, you would not even know what they are called. So better chose one and do an check on it to see reviews.

As you do not state where you are from, and what visa you might already have, we can not help you in finding places that would welcome you.
You can stay in the UK, as it has many places worth visiting.

If you want to travel internationally, check the embassy site of the countries you are interested in, they will state what you need to enter.
There are also lists on-line for people of the USA, UK, and some more, telling for which country you need which papers, (passport, visa, letter of invitation, .....) but I do not know where they are.
(Google would.)