UK Landlord Forum / Life

Good morning all,
Hope fully someone will be able to point me in the right direction for this. My husband and I have are just about to finish a new build development of 4 x 3 Bedroomed houses. Although we have a modest portfolio of rental properties, we would rather sell these 4 one and move on to the next project(s). My question is, is there a website/company where we could advertise these properties, specifically aimed at Buy To Let investors? We would rather sell them as a complete entity and they are in a high demand area.
Can anyone point me in the direction of such a company?
Cheers, Fe