capital gain group

Sir i understand that assets within capital gain group members are transferred at no loss/no gain . So if the cost of of an asset is £100000 and indexed cost is £130000 at the date of transfer to group member company,its base cost will be £130000 to the company acquiring the asset. But what happens if first company sold the asset to its group member company at £150000. Deemed proceed will be 130000 as above but how is £150000 which company received from group member company is accounted for?