Gym List Contact Data Entry to sell

I already have a spreadsheet with the names of London-based gyms and now need the contact details filled in or corrected. The file is set up with columns for main phone number, email, street address, postcode, website and (where available) Instagram or Facebook links. Your job is to populate every blank cell, double-check anything that looks incomplete, and keep the formatting consistent throughout.

To do this you will probably look at each gym’s official site, social pages, or reputable directories and then paste the information directly into the sheet—one row per gym, no new columns. Accuracy matters more than speed, so take a moment to verify spelling, postcodes and dial-codes before you mark a row done.

Deliverable: the original spreadsheet returned with all contact information fully completed and obvious errors removed. A quick spot-check sheet or colour-coding is welcome if it helps show which entries you had to update the most.
If anybody needs a ready Gym list from London You can quote