Upvote:1
If the validity period covers the 6-week observership you documented in your visa application, then an ECO may have made a decision based on that information. However, if the visa validity period is insufficient for the program (although not any additional period), then you should contact the visa application centre through which you submitted.
Once you're in the UK, you may be eligible to request an extension although doing for tourism may not be approved. If you were issued a single-entry visa, you cannot change its validity period from within the UK.
Alternatively, you could make contact UK Visas and Immigration help centre, a fee-based service:
You can call or email English-speaking* staff with a question about your application.
By phone
Telephone: 00 44 203 481 1736
Monday to Friday, 24 hours
Calls cost £1.37 per minute on top of your standard network charges.By email
Email UK Visas and Immigration.
Emails enquiries cost £5.48. You will not be charged for any follow-up emails about the same enquiry.You’ll get a reply to your email within 2 days, except on Saturdays, Sundays and UK public holidays.
*Service is available in other languages.