You may have received another letter from a firm of solicitors close to Sua Casa, a trading style of The Resort Group PLC (TRG) offering to assist with the closure of your SIPP.
Rowanmoor Personal Pensions Limited, one of the UK's largest independent self-invested personal pension providers, responsible for 14,000 investors, has entered administration following on from a Financial Ombudsman decision late last year.
The Guardian Pension Consultants (GPC SIPP) entered administration in June 2019, due to problems with the investments in SIPP pension portfolios. It was then bought by Hartley Pensions Limited in August 2019.