3d) A sum of ready cash makes you solvent. (6) ?F???T
20a) End up with one mobile still in its wrapping (8) ??????E?
22a) Engineer retains Telford's first model railway (5,3) ?R??????
26a) Dream and bet on it non-stop, going bust? (3-5,6) ?N?-????? ?????T
All help much appreciated