I don't think the clock tower was moved for the flyovers, but I still have an element of doubt that I might be wrong. Surely there was enough room to realign the flyover if needed, as the site was being enlarged anyway. The land was not used as a roundabout, as Borough Road took both town and tunnel trafic along its south side, while Clifton Crescent was merely a little backwater serving the Hotel and adjacent premises. It was also two-way, but had traffic lights at one end.
Clifton Crescent was widened at the time at the time of the roadworks, and as mentioned above, it lost its wide pavement opposite the Hotel in preparation for becoming part of the roundabout. As part of the final phase of the works, the piece of land was enlarged into the roundabout as we now know it, and this included a now isolated part of Borough Road.
I hope that no one is confusing the (possible) shift of the clock tower with the actual shift of the column outside the Mersey Tunnel entrance - that being the big black column with the ball on top in true 1930's art deco style.
I've attached some pictures, starting with 1967 during construction works. On the far left is Horsemans car showrooms at the bottom of Argyle St South, opposite the station, while on the far right by the traffic light, is Taffy's Carpets showroom. One of the two people in the middle is a traffic warden. For comparison is a photo from earlier this year.
The third photo was taken on the flyover open day in 1969, just before it opened to traffic, and from the Conway Street flyover. The ammount of space avaliable to clear the flyover is quite apparent. The busy road in the forground, taking two way traffic to the tunnel, is now Borough Road East. First road on the left is Thomas Street. The next road is the end of the link flyover from New Chester Road, but next to it is Hind Street, which emerges up from the side of the gasworks and along the side of Central station where it joins Borough Road. Note the wooden hut - it was a taxi office (for Murphys, I think.) A similar one stood outside the pumping station at Woodside, between Canning St and Shore Rd.
Description: Clifton Crescent, 1967.
Description: Clifton Crescent, 2012.