The link to send comments to the U.K. Treasury is:
Email nonresidentspersonalallowanceconsultation@hmtreasury.gsi.gov.uk
Or to write to:
Specialist Personal Tax consultation
HM Treasury
1 Horse Guards Road
London SW1A 2HQ
Some more helpful information can be found in the links below :
Automatic Exchange of and the Swiss Voluntary Tax Programme
Income Taxes on Residents
Liability to Tax on Income Arising in the UK
Relief from Double Taxation
Annuities and Exemption from Income Tax
International tax: UK – Switzerland Double Taxation Convention (Form Switzerland-Company)(English German)
Switzerland: tax treaties
Other Individual Taxes
Tax Returns
Payment of Tax in Instalments
Inheritance Tax: Double Taxation Relief
Applications and claims by non-residents under double taxation treaties
Payment of Tax in Instalments
Inheritance Tax: Double Taxation Relief
Applications and claims by non-residents under double taxation treaties
Restricting non-residents’ entitlement to the UK personal allowance