The family – Shane Davies, his wife Rhianna, mother Sheila and sister Tracey – have not been convicted, but agreed to surrender the assets conceding they derived them from the proceeds of unlawful conduct.
The portfolio included a seven-bedroom converted barn and mill in Norton St Philip, Somerset, which was listed on a holiday lettings website with an indoor swimming pool, jacuzzi and five bathrooms.
The group also owned an 18th Century Georgian townhouse in Bath, which operated as the Roman City Guest House.
The NCA recovered a villa in Tenerife, a Range Rover Evoque and 16 other properties in and around Bath and Somerset.
“The Canary Islands holiday home and prestige vehicle represent the obvious trappings of wealth,” said Andy Lewis, head of asset denial at the NCA.
“But equally importantly, we recovered numerous commercial and residential properties which otherwise would have continued to generate substantial revenue that the defendants were not entitled to.”
The clan’s property empire netted more than £2m in rental and commercial income between 2004 and 2009, the NCA found.
The NCA claimed the portfolio had been acquired through mortgage fraud and the sale of controlled drugs.
The Davies’ countered that funds used to purchase the properties were gifted, but were unable to substantiate the claims.
“This investigation identified unlawfully-held assets worth millions of pounds,” said Lewis.
“It’s vital to the UK’s economic wellbeing that assets are held legitimately and we’re determined to recover property acquired through the proceeds of serious and organised crime,” he said.
Gareth Kitchener, detective sergeant at Avon & Somerset Police, added: “This fantastic result testifies to the tenacity of the NCA investigators who took this case forward. Civil recovery powers are extremely powerful in the fight against organised crime.”