Tax Question of the Week: Property Swap

Jack and Jill jointly own two investment properties and wish to swap their interests so that they each have ownership of one of the properties. As tenants in common they currently equally own Cornfield with a market value of £210,000 and the original cost of £50,000 and Wheatfield with a market value of £200,000 and the original cost of £49,000. Jack is to have Cornfield and Jill is to have Wheatfield. What are the CGT and SDLT implications?