EUROSCEPTIC Tories have told Boris Johnson he must cut taxes now to put booster rockets under Brexit.
Leading MPs said the PM was squandering his golden chance to make Britain the best place to work and do business.
Sir Iain Duncan Smith blasted the Government for clobbering firms and employees with record peacetime tax whacks.
Corporation tax has been jacked up to 19 per cent while National Insurance rates have also shot up.
The ex-Conservative leader fumed the Treasury was “determined to destroy” the economy and even suggested it was “the enemy within”.
It says: “It has been clear for some time that Brexit policy has not enjoyed such support from many officials.
“Moreover, evidence has accumulated suggesting civil servants may not always be competent to carry out their responsibilities and that social mores and value judgements are interfering with getting the job done.”