I don't think they do.
I recall set proportions were put aside for retail investors, institutions staff, some to be retained by government and a proportion for private investors. The government wants lots of small shareholders to have a stake in the company.
The institutions will include pension funds and I doubt they will sell up quickly- these are likely to be good value in the long term and will generate good dividends of 6%+. And of course these pension funds equate to our money (if we have a pension fund), so it's good news if they have some RM shares.
Among private investors those applying for the minimum figure of £750 will get all their allocation but larger investors will have theirs scaled back, with those trying to invest over £10000 getting nothing, so the smaller investors are doing well out of it compared to others.
The staff will do well out of it too. I think their shares were free.
Of course those organising the sale will have done very nicely in fees.