Williams and Frenchman Francois Trinh-Duc are the Baa-Baas' latest additions for the 3 December fixture.
England will field five uncapped players against a Baa-Baas side whose members have played a collective 1, 000 internationals.
The Baa-Baas will face England at Twickenham, an International XV in Brussels while the third fixture is to be finalised.
The Baa-Baas will play England at Twickenham, west London, on May 26 before flying to Hong Kong for the Lions match.
This term his return is down, with the score for England against the Baa-Baas at Twickenham his seventh of the season.
Cipriani's Wasps team-mate Paul Sackey has also been included by the Baa-Baas.
They are due to club commitments, while Clermont Auvergne have refused Springbok captain John Smit permission to face the Baa-Baas at Twickenham on 1 December.
The Baa-Baas squad also includes England captain Steve Borthwick.
The Baa-Baas side is brimming with talent and contains a trio of Welshmen with a point to prove: Hook, Peel and Matthew Rees, all former Lions who weren't selected for this tour.
Mortlock and Turner were both denied further tries before the Baa-Baas got off the mark with the last move of the half, a length-of-the-field effort finished by Balshaw in the left corner.
"We have been very impressed with Rowan's contribution to the game in Hong Kong and have no hesitation in inviting him to be part of our squad, " Derek Quinnell, team manager of the Barbarians, or Baa-Baas, said in a statement following Varty's selection last month.
Runners began streaming into the BAA offices mid-morning Wednesday, some wearing their race bibs.
Five further roads, including the Mountain Road from the Bungalow to the Creg-ny-Baa, were reopened on Monday.
Repair work is ongoing on the A18 Mountain Road, specifically at the Creg-ny-baa, the Gooseneck and Ramsey Hairpin.
Six roads including the A18 Mountain Road between Ramsey Hairpin and the Creg-ny-baa will not reopen until 08:00 GMT on Tuesday.
Organisers said the fanzones were chosen for their breathtaking views of sections of the course such as Crosby jump where bikes can hit 180mph and locations such as Ginger Hall on the edge of Sulby village and Creg-ny-Baa where spectators will see the riders as they approach from Kate's Cottage and the sweeping run downhill into Brandish.
But it lays much of the blame on BAA's near-monopoly on air travel in Britain.
Air travellers will have to wait a while to see the benefits of BAA's break-up.
ECONOMIST: Breaking up BAA: A new departure for London’s airports | The
BAA's UK airports - which also include Heathrow, Gatwick and Stansted - handled a record 14.2 million passengers in July, a rise of 8% on last year.
Ferrovial's interest has attracted support from budget airline Ryanair's chief executive Michael O'Leary, who has long campaigned for the break-up of BAA, according to a report in the Sunday Express.
"BAA provides a free service up to the point of check-in when the airlines take over and they provide assistance from the check-in to the aircraft", a BAA spokeswoman told BBC News Online.
Airport operator BAA argues Heathrow is "jam-packed" and needs a third runway to remain competitive globally.
The biggest loser from a shake-up will be BAA's current owner, Ferrovial.
ECONOMIST: Breaking up BAA: A new departure for London’s airports | The
In 1991 the newly-privatised British Airports Authority, BAA, put the airport on the market.
BBC: Prestwick Airport records big fall in passenger numbers
In 1991 the newly-privatised British Airports Authority, BAA, put it on the market.
In 1991 the newly-privatised British Airports Authority, BAA, put Prestwick on the market.
Later this year, the Competition Commission will almost certainly insist that BAA surrender its airport monopoly in the south-east by selling Gatwick and Stansted.
This book was the result of a stint the essayist and philosopher spent at Heathrow in the summer, after its owner, BAA, installed him as a temporary writer-in-residence.
In making its ruling, the commission decided that the lack of competition in the south-east of England, where BAA also operates Heathrow, and in lowland Scotland was bad for passengers and airlines.
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