The Consumer Code states the following on sales practices and performance estimates:

Sales Practices

“Sales employees must not give false or misleading information about their company or the product, service or facilities being offered.”

“They must not make any statement that is likely to mislead the consumer in any way.”

“Sales employees must not use any high-pressure selling techniques, including (but not limited to):
staying in the consumer’s premises for more than two hours
offering a high initial price followed by a discount
offering a discount for signing on the day
withholding price information until the end of the visit
claiming that there is limited availability of the product.”

UK Solar Power Panels Ltd thoroughly endorses these standards.

Performance Estimates

“Members must present calculations using recognised international standards or the guidelines provided by the scheme administrator and based on the Microgenerator Certification Scheme (MCS).

They must provide comparisons for non-expert readers, with predictions presented according to those guidelines.

Calculations must be based on product information which has been confirmed by an independent test laboratory in line with all standards that apply.

Proposals to consumers must only include estimates of savings, periods of recovery (‘payback’) or other measures of financial effectiveness where these are based on information from the consumer on his or her existing energy use and cost and should not mislead the consumer into affecting their economic behaviour.”