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Your mortgage adviser provides you with advice on your mortgage, not the legal title that you have purchased so you would almost certainly not be able to sue them for this.
I would normally expect the solicitor to report to you prior to exchange of contracts how long is left on the lease and then also to tell you (1) the approximate required length of time that mortgage lenders require on the term of the lease in order to grant a mortgage and (2) that there is legislation in place to allow you to extend the lease for a fee to be calculated under the statutory procedure.
If the solicitor did not do this and you have evidence of this then you might be able to sue them. However, you would have to contact them first and lodge any official complaint, exhaust their complaints procedure and then thereafter refer to the legal ombudsmen and then sue them.
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It is not the mortgage advisor's responsibility to advise you on the length of term remaining on the lease. It is the solicitor's responsibility to do this and if they have not you might be able to first complaint and then second sue them.
As to life insurance, it would be the financial advisor that you would sue if they incorrectly advised you to buy a financial product.Tom