Connecting between Glasgow Buchanan & Glasgow Central

Hi,
I have a connection tomorrow (Mon) between Glasgow Buchanan coach station & Glasgow Central rail station. Scheduled to arrive on the Citylink coach from Inverness (G10) at Glasgow Buchanan station at 1200hrs with my onward train to Euston at 1240hrs. Is that enough time to connect, even if the coach arrival is up to 10 mins late? Will either pre-book a taxi or Uber for the transfer. I'm kind of having major doubts that it doesn't leave me with enough time if the coach is up to 30mins late arriving at Glasgow (I believe there's major roadworks on the A9 just north of Perth), potentially costing me another £150+ if I have to catch the later train to Euston at 1340hrs (current ticket is non-refundable). I'm seriously considering taking an earlier bus to Glasgow or the train to Queen St for peace of mind - even though it will cost me another £30-£40. Again my current coach ticket is non-refundable. Any suggestions?
Cheers