3 pages and still nobody has given the correct answer 
In short, yes, through roadworks, you’re entitled to use the right hand lane where ANY lane is closed, assuming there are no ‘other’ restrictions (width, etc). Also, you can use it to pass exceptionally wide loads. And if a lane turns into an off/on-slip and there’s only 2 other lanes.
Links (my bolding/highlighting):
In Scotland:
The Motorways Traffic (Scotland) Regulations 1995
legislation.gov.uk/uksi/1995 … on/11/made
Restriction on use of right-hand lane
11.—(1) This regulation applies to—
(a)a goods vehicle having a maximum laden weight exceeding 7.5 tonnes,
(b)a motor vehicle constructed solely for the carriage of passengers and their effects the overall length of which exceeds 12 metres;
(c)a motor vehicle drawing a trailer; and
(d)a vehicle which is a motor tractor, a light locomotive or a heavy locomotive.
(2) Subject to the provisions of paragraphs (3) and (4) below, no vehicle to which this regulation applies shall be driven, or moved, or stopped, or remain at rest on the right-hand lane of a length of carriageway which has 3 or more traffic lanes at any place where all the lanes are open for use by traffic proceeding in the same direction.
(3) The prohibition contained in paragraph (2) above shall not apply to a vehicle—
(a)while it is being driven on any right-hand lane such as is mentioned in that paragraph insofar as it is necessary for the vehicle to be driven to enable it to pass another vehicle which is carrying or drawing a load of exceptional width; or
(b)so as to prevent that vehicle joining or leaving the motorway by means of a road giving access to or from that motorway on the right hand side of the carriageway.
(4) Nothing in this regulation shall have effect so as to require a vehicle to change lane during a period when it would not be reasonably practicable for it to do so without involving danger or injury to any person or inconvenience to other traffic.
(5) In this regulation—
“goods vehicle” and “maximum laden weight” have the same meanings as in Schedule 6 to the 1984 Act; and
“overall length” has the meaning given by regulation 3(2) of the Road Vehicles (Construction and Use) Regulations 1986(1).
In England & Wales:
The Motorways Traffic (England and Wales) Regulations 1982
legislation.gov.uk/uksi/1982 … tents/made
The text is only available as a PDF, can be downloaded above.
Page 4, regulation 12. Wording is pretty much exactly as above as per Scotland. There have been various amendments over the years, but none that remove /substantially change this point.
HTH.