You need UK Visa. Here is where you can apply for it.
You will find all the information you need if you follow this link.
http://www.fco.gov.uk/en/travel-and-living-abroad/find-an-embassy/europe/embassy-rome

You have to apply for your Schengen Visa in Saudi Arabia because you are employed in Saudi.
When you apply you have provide the following documents with your Visa Application.

Passport valid at least for one year from the date of your travel

Your place of residence in Saudi (full address, with Tel No,)
At times they ask for police report from the area where you reside in Saudi.

Letter of employment from your employer stating your monthly salary and
How long you are in their employment,
Whether you have been granted leave for the period you will away from Saudi.

Whether you have a work permit and for how long it is valid
Your valid Residence Visa to Saudi (it should be endorsed on your Passport)
Your Saudi Residence permit must be valid for at least one year from the day you apply.

Any details friends or relations in Germany and if you did have, then letters from them to assure you will leave Schengen states before the expiry of Schengen Visa

Medical Insurance covering the period you will be in the Schengen countries.
Your travel itinerary, Return Air Ticket with confirmed hotel bookings.

Finally you will be required to pay non-refundable Visa fees. In case you are refused Visa the fees will not be refunded.

You son has to apply for his Visa in India.

I understand your frustration on getting the Schengen visa. Let me explain
why it could have been refused.

Since you hold an Indian Passport and travelled to Britain for which you had obtained a Visa to UK from India you should also have arranged your holiday while in India to Germany and Switzerland and applied for your Swiss Visa followed by the Schengen Visa in India.

The reason why I say (first your Swiss Visa followed by the Schengen Visas in India.) is that you intend entering Swiss via Germany.

The possession of a Schengen tourist visa does not allow you entry to Swiss from any of the Schengen state countries. On the other hand if you had a Permanent Resident Visa from any Schengen countries you would be allowed entry in to Swiss because you are employed and you have no problem getting back to the Schengen state country where you permanently reside even though you might hold an Indian passport.

Under normal circumstances holding the little Blue Book from India or for that matter any other 3rd world country is the reason. Because in the last 3 decades there was so much human trafficking from some of the countries.

For example Many people fled Sri Lanka due the war.

Most came through several other countries before they arrived in any Schengen country purposely losing their Passports and applying for refuge status. So making entry illegally they lived on state benefits and walked through fields into neighboring countries and applied for benefits there too.

So actually almost all the Schengen state countries had this problem and started closing the loopholes. You are facing this problem because thousands of such people set a bad precedence.

So your assumption that they collect Visa fees to fund their financial crises is unfounded.

Any one coming to Britain and arranging a holiday to any Schengen country could face similar refusals.

If you need any further information please post your question @Rajpriya
on NRI.

I hope my message is clear. I will give correct information. I live in Germany.

No wonder, Portugese job seekers have flooded into Angola now. Take that, Europe. Watch out Angola, there is a flood of worthless, jobless, welfare whoring Europeans headed your way!

And of course, I read about British butlers in heavy demand in rich households in China and Russia!

And of course, I wonder why Indians need visas to travel to Britain when TATA is the No. 1 industrial employer of Brits. With 8000 Brits lined up for 1000 jobs at TATA, they would do well to humble themselves.

Is the schengen Visa process same for People going on work permits? Or is it a bit easy ? Was curious to know, how difficult can it be ..